BaseController和BaseService, 直接部署好增删改查!!!
唐兴思
使用sql拼接成的BaseController和BaseService
BaseController
package com.project.demo.controller.base;
import com.alibaba.fastjson.JSONArray;
import com.alibaba.fastjson.JSONObject;
import com.project.demo.service.base.BaseService;
import lombok.Setter;
import lombok.extern.slf4j.Slf4j;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.multipart.MultipartFile;
import javax.persistence.Query;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.IOException;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
/**
*/
@Slf4j
public class BaseController<E, S extends BaseService<E>> {
@Setter
protected S service;
@PostMapping("/add")
@Transactional
public Map<String, Object> add(HttpServletRequest request) throws IOException {
service.insert(service.readBody(request.getReader()));
return success(1);
}
@Transactional
public Map<String, Object> addMap(Map<String,Object> map){
service.insert(map);
return success(1);
}
@PostMapping("/set")
@Transactional
public Map<String, Object> set(HttpServletRequest request) throws IOException {
service.update(service.readQuery(request), service.readConfig(request), service.readBody(request.getReader()));
return success(1);
}
@RequestMapping(value = "/del")
@Transactional
public Map<String, Object> del(HttpServletRequest request) {
service.delete(service.readQuery(request), service.readConfig(request));
return success(1);
}
@RequestMapping("/get_obj")
public Map<String, Object> obj(HttpServletRequest request) {
Query select = service.select(service.readQuery(request), service.readConfig(request));
List resultList = select.getResultList();
if (resultList.size() > 0) {
JSONObject jsonObject = new JSONObject();
jsonObject.put("obj",resultList.get(0));
return success(jsonObject);
} else {
return success(null);
}
}
@RequestMapping("/get_list")
public Map<String, Object> getList(HttpServletRequest request) {
Map<String, Object> map = service.selectToPage(service.readQuery(request), service.readConfig(request));
return success(map);
}
@RequestMapping("/list_group")
public Map<String, Object> listGroup(HttpServletRequest request) {
Map<String, Object> map = service.selectToList(service.readQuery(request), service.readConfig(request));
return success(map);
}
@RequestMapping("/bar_group")
public Map<String, Object> barGroup(HttpServletRequest request) {
Map<String, Object> map = service.selectBarGroup(service.readQuery(request), service.readConfig(request));
return success(map);
}
@RequestMapping(value = {"/count_group", "/count"})
public Map<String, Object> count(HttpServletRequest request) {
Query count = service.count(service.readQuery(request), service.readConfig(request));
return success(count.getResultList());
}
@RequestMapping(value = {"/sum_group", "/sum"})
public Map<String, Object> sum(HttpServletRequest request) {
Query count = service.sum(service.readQuery(request), service.readConfig(request));
return success(count.getResultList());
}
@RequestMapping(value = {"/avg_group", "/avg"})
public Map<String, Object> avg(HttpServletRequest request) {
Query count = service.avg(service.readQuery(request), service.readConfig(request));
return success(count.getResultList());
}
@PostMapping("/upload")
public Map<String, Object> upload(@RequestParam("file") MultipartFile file) {
log.info("进入方法");
if (file.isEmpty()) {
return error(30000, "没有选择文件");
}
try {
//判断有没路径，没有则创建
String filePath = System.getProperty("user.dir") + "\\target\\classes\\static\\upload\\";
File targetDir = new File(filePath);
if (!targetDir.exists() && !targetDir.isDirectory()) {
if (targetDir.mkdirs()) {
log.info("创建目录成功");
} else {
log.error("创建目录失败");
}
}
// String path = ResourceUtils.getURL("classpath:").getPath() + "static/upload/";
// String filePath = path.replace('/', '\\').substring(1, path.length());
String fileName = file.getOriginalFilename();
File dest = new File(filePath + fileName);
log.info("文件路径:{}", dest.getPath());
log.info("文件名:{}", dest.getName());
file.transferTo(dest);
JSONObject jsonObject = new JSONObject();
jsonObject.put("url", "/api/upload/" + fileName);
return success(jsonObject);
} catch (IOException e) {
log.info("上传失败：{}", e.getMessage());
}
return error(30000, "上传失败");
}
@PostMapping("/import_db")
public Map<String, Object> importDb(@RequestParam("file") MultipartFile file) throws IOException {
service.importDb(file);
return success(1);
}
@RequestMapping("/export_db")
public void exportDb(HttpServletRequest request, HttpServletResponse response) throws IOException {
HSSFWorkbook sheets = service.exportDb(service.readQuery(request), service.readConfig(request));
response.setContentType("application/octet-stream");
response.setHeader("Content-disposition", "attachment;filename=employee.xls");
response.flushBuffer();
sheets.write(response.getOutputStream());
sheets.close();
}
public Map<String, Object> success(Object o) {
Map<String, Object> map = new HashMap<>();
if (o == null) {
map.put("result", null);
return map;
}
if (o instanceof List) {
if (((List) o).size() == 1) {
o = ((List) o).get(0);
map.put("result", o);
}else {
String jsonString = JSONObject.toJSONString(o);
JSONArray objects = service.covertArray(JSONObject.parseArray(jsonString));
map.put("result", objects);
}
} else if (o instanceof Integer || o instanceof String) {
map.put("result", o);
} else {
String jsonString = JSONObject.toJSONString(o);
JSONObject jsonObject = JSONObject.parseObject(jsonString);
JSONObject j = service.covertObject(jsonObject);
map.put("result", j);
}
return map;
}
public Map<String, Object> error(Integer code, String message) {
Map<String, Object> map = new HashMap<>();
map.put("error", new HashMap<String, Object>(4) {{
put("code", code);
put("message", message);
}});
return map;
}
}
BaseService
package com.project.demo.service.base;
import com.alibaba.fastjson.JSONArray;
import com.alibaba.fastjson.JSONObject;
import com.project.demo.constant.FindConfig;
import lombok.extern.slf4j.Slf4j;
import org.apache.poi.hssf.usermodel.*;
import org.apache.poi.ss.usermodel.*;
import org.apache.poi.xssf.usermodel.XSSFWorkbook;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.web.multipart.MultipartFile;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
import javax.persistence.Query;
import javax.servlet.http.HttpServletRequest;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.UnsupportedEncodingException;
import java.lang.reflect.ParameterizedType;
import java.net.URLDecoder;
import java.security.MessageDigest;
import java.util.*;
/**
*
*/
@Slf4j
public class BaseService<E> {
Class<E> eClass = (Class<E>) ((ParameterizedType) getClass().getGenericSuperclass()).getActualTypeArguments()[0];
private final String table = humpToLine(eClass.getSimpleName());
@Autowired
@PersistenceContext
private EntityManager entityManager;
public static String humpToLine(String str) {
if (str == null) {
return null;
}
// 将驼峰字符串转换成数组
char[] charArray = str.toCharArray();
StringBuilder buffer = new StringBuilder();
//处理字符串
for (int i = 0, l = charArray.length; i < l; i++) {
if (charArray[i] >= 65 && charArray[i] <= 90) {
buffer.append("_").append(charArray[i] += 32);
} else {
buffer.append(charArray[i]);
}
}
String s = buffer.toString();
if (s.startsWith("_")) {
return s.substring(1);
} else {
return s;
}
}
public Query runEntitySql(String sql) {
return entityManager.createNativeQuery(sql, eClass);
}
public Query runCountSql(String sql) {
return entityManager.createNativeQuery(sql);
}
public void insert(Map<String, Object> body) {
StringBuffer sql = new StringBuffer("INSERT INTO ");
sql.append("`").append(table).append("`").append(" (");
for (Map.Entry<String, Object> entry : body.entrySet()) {
sql.append("`" + humpToLine(entry.getKey()) + "`").append(",");
}
sql.deleteCharAt(sql.length() - 1);
sql.append(") VALUES (");
for (Map.Entry<String, Object> entry : body.entrySet()) {
Object value = entry.getValue();
if (value instanceof String) {
sql.append("'").append(entry.getValue()).append("'").append(",");
} else {
sql.append(entry.getValue()).append(",");
}
}
sql.deleteCharAt(sql.length() - 1);
sql.append(")");
log.info("[{}] - 插入操作：{}", table, sql);
Query query = runCountSql(sql.toString());
query.executeUpdate();
}
@Transactional
public void update(Map<String, String> query, Map<String, String> config, Map<String, Object> body) {
StringBuffer sql = new StringBuffer("UPDATE ").append("`").append(table).append("`").append(" SET ");
for (Map.Entry<String, Object> entry : body.entrySet()) {
Object value = entry.getValue();
if (value instanceof String) {
sql.append("`" + humpToLine(entry.getKey()) + "`").append("=").append("'").append(value).append("'").append(",");
} else {
sql.append("`" + humpToLine(entry.getKey()) + "`").append("=").append(value).append(",");
}
}
sql.deleteCharAt(sql.length() - 1);
sql.append(toWhereSql(query, "0".equals(config.get(FindConfig.LIKE))));
// sql.append(";");
log.info("[{}] - 更新操作：{}", table, sql);
Query query1 = runCountSql(sql.toString());
query1.executeUpdate();
}
public Map<String, Object> selectToPage(Map<String, String> query, Map<String, String> config) {
Query select = select(query, config);
Map<String, Object> map = new HashMap<>();
map.put("list", select.getResultList());
map.put("count", count(query, config).getSingleResult());
return map;
}
public Map<String, Object> selectToList(Map<String, String> query, Map<String, String> config) {
Query select = selectGroupCount(query, config);
Map<String, Object> map = new HashMap<>();
map.put("list", select.getResultList());
return map;
}
public Map<String, Object> selectBarGroup(Map<String, String> query, Map<String, String> config) {
Query select = barGroup(query, config);
Map<String, Object> map = new HashMap<>();
map.put("list", select.getResultList());
return map;
}
public Query barGroup(Map<String, String> query, Map<String, String> config) {
StringBuffer sql = new StringBuffer(" SELECT ");
if (config.get(FindConfig.GROUP_BY) != null && !"".equals(config.get(FindConfig.GROUP_BY))) {
sql.append(config.get(FindConfig.GROUP_BY));
if (config.get(FindConfig.FIELD) != null && !"".equals(config.get(FindConfig.FIELD))) {
String[] fieldList = config.get(FindConfig.FIELD).split(",");
for (int i = 0; i < fieldList.length; i++)
sql.append(" ,SUM(").append(fieldList[i]).append(")");
}
sql.append(" FROM ").append("`").append(table).append("`");
sql.append(toWhereSql(query, "0".equals(config.get(FindConfig.LIKE))));
sql.append(" ").append("GROUP BY ").append(config.get(FindConfig.GROUP_BY));
} else {
sql.append(" SUM(").append(config.get(FindConfig.GROUP_BY)).append(") FROM ").append("`").append(table).append("`");
sql.append(toWhereSql(query, "0".equals(config.get(FindConfig.LIKE))));
}
log.info("[{}] - 查询操作，sql: {}", table, sql);
return runCountSql(sql.toString());
}
public Query selectGroupCount(Map<String, String> query, Map<String, String> config) {
StringBuffer sql = new StringBuffer("select COUNT(*) AS count_value, ");
sql.append(config.get(FindConfig.GROUP_BY)).append(" ");
sql.append("from ").append("`").append(table).append("` ");
sql.append(toWhereSql(query, "0".equals(config.get(FindConfig.LIKE))));
if (config.get(FindConfig.GROUP_BY) != null && !"".equals(config.get(FindConfig.GROUP_BY))) {
sql.append("group by ").append(config.get(FindConfig.GROUP_BY)).append(" ");
}
log.info("[{}] - 查询操作，sql: {}", table, sql);
return runCountSql(sql.toString());
}
public Query select(Map<String, String> query, Map<String, String> config) {
StringBuffer sql = new StringBuffer("select ");
sql.append(config.get(FindConfig.FIELD) == null || "".equals(config.get(FindConfig.FIELD)) ? "*" : config.get(FindConfig.FIELD)).append(" ");
sql.append("from ").append("`").append(table).append("`").append(toWhereSql(query, "0".equals(config.get(FindConfig.LIKE))));
if (config.get(FindConfig.GROUP_BY) != null && !"".equals(config.get(FindConfig.GROUP_BY))) {
sql.append("group by ").append(config.get(FindConfig.GROUP_BY)).append(" ");
}
if (config.get(FindConfig.ORDER_BY) != null && !"".equals(config.get(FindConfig.ORDER_BY))) {
sql.append("order by ").append(config.get(FindConfig.ORDER_BY)).append(" ");
}
if (config.get(FindConfig.PAGE) != null && !"".equals(config.get(FindConfig.PAGE))) {
int page = config.get(FindConfig.PAGE) != null && !"".equals(config.get(FindConfig.PAGE)) ? Integer.parseInt(config.get(FindConfig.PAGE)) : 1;
int limit = config.get(FindConfig.SIZE) != null && !"".equals(config.get(FindConfig.SIZE)) ? Integer.parseInt(config.get(FindConfig.SIZE)) : 10;
sql.append(" limit ").append((page - 1) * limit).append(" , ").append(limit);
}
log.info("[{}] - 查询操作，sql: {}", table, sql);
return runEntitySql(sql.toString());
}
@Transactional
public void delete(Map<String, String> query, Map<String, String> config) {
StringBuffer sql = new StringBuffer("DELETE FROM ").append("`").append(table).append("`").append(" ");
sql.append(toWhereSql(query, "0".equals(config.get(FindConfig.GROUP_BY))));
log.info("[{}] - 删除操作：{}", table, sql);
Query query1 = runCountSql(sql.toString());
query1.executeUpdate();
}
public Query count(Map<String, String> query, Map<String, String> config) {
StringBuffer sql = new StringBuffer("SELECT ");
// log.info("拼接统计函数前");
if (config.get(FindConfig.GROUP_BY) != null && !"".equals(config.get(FindConfig.GROUP_BY))) {
sql.append(config.get(FindConfig.GROUP_BY)).append(" ,COUNT(").append(config.get(FindConfig.GROUP_BY)).append(") FROM ").append("`").append(table).append("`");
sql.append(toWhereSql(query, "0".equals(config.get(FindConfig.LIKE))));
// sql.append(" ").append("GROUP BY ").append(config.get(FindConfig.GROUP_BY));
} else {
sql.append("COUNT(*) FROM ").append("`").append(table).append("`");
sql.append(toWhereSql(query, "0".equals(config.get(FindConfig.LIKE))));
}
log.info("[{}] - 统计操作，sql: {}", table, sql);
return runCountSql(sql.toString());
}
public Query sum(Map<String, String> query, Map<String, String> config) {
StringBuffer sql = new StringBuffer(" SELECT ");
if (config.get(FindConfig.GROUP_BY) != null && !"".equals(config.get(FindConfig.GROUP_BY))) {
sql.append(config.get(FindConfig.GROUP_BY)).append(" ,SUM(").append(config.get(FindConfig.FIELD)).append(") FROM ").append("`").append(table).append("`");
sql.append(toWhereSql(query, "0".equals(config.get(FindConfig.LIKE))));
sql.append(" ").append("GROUP BY ").append(config.get(FindConfig.GROUP_BY));
} else {
sql.append(" SUM(").append(config.get(FindConfig.FIELD)).append(") FROM ").append("`").append(table).append("`");
sql.append(toWhereSql(query, "0".equals(config.get(FindConfig.LIKE))));
}
log.info("[{}] - 查询操作，sql: {}", table, sql);
return runCountSql(sql.toString());
}
public Query avg(Map<String, String> query, Map<String, String> config) {
StringBuffer sql = new StringBuffer(" SELECT ");
if (config.get(FindConfig.GROUP_BY) != null && !"".equals(config.get(FindConfig.GROUP_BY))) {
sql.append(config.get(FindConfig.GROUP_BY)).append(" ,AVG(").append(config.get(FindConfig.FIELD)).append(") FROM ").append("`").append(table).append("`");
sql.append(toWhereSql(query, "0".equals(config.get(FindConfig.LIKE))));
sql.append(" ").append("GROUP BY ").append(config.get(FindConfig.GROUP_BY));
} else {
sql.append(" AVG(").append(config.get(FindConfig.FIELD)).append(") FROM ").append("`").append(table).append("`");
sql.append(toWhereSql(query, "0".equals(config.get(FindConfig.LIKE))));
}
log.info("[{}] - 查询操作，sql: {}", table, sql);
return runCountSql(sql.toString());
}
public String toWhereSql(Map<String, String> query, Boolean like) {
if (query.size() > 0) {
try {
StringBuilder sql = new StringBuilder(" WHERE ");
for (Map.Entry<String, String> entry : query.entrySet()) {
if (entry.getKey().contains(FindConfig.MIN_)) {
String min = humpToLine(entry.getKey()).replace("_min", "");
sql.append("`" + min + "`").append(" >= '").append(URLDecoder.decode(entry.getValue(), "UTF-8")).append("' and ");
continue;
}
if (entry.getKey().contains(FindConfig.MAX_)) {
String max = humpToLine(entry.getKey()).replace("_max", "");
sql.append("`" + max + "`").append(" <= '").append(URLDecoder.decode(entry.getValue(), "UTF-8")).append("' and ");
continue;
}
if (like == true) {
sql.append("`" + humpToLine(entry.getKey()) + "`").append(" LIKE '%").append(URLDecoder.decode(entry.getValue(), "UTF-8")).append("%'").append(" and ");
} else {
sql.append("`" + humpToLine(entry.getKey()) + "`").append(" = '").append(URLDecoder.decode(entry.getValue(), "UTF-8")).append("'").append(" and ");
}
}
sql.delete(sql.length() - 4, sql.length());
sql.append(" ");
return sql.toString();
} catch (UnsupportedEncodingException e) {
log.info("拼接sql 失败：{}", e.getMessage());
}
}
return "";
}
public Map<String, Object> readBody(BufferedReader reader) {
BufferedReader br = null;
StringBuilder sb = new StringBuilder("");
try {
br = reader;
String str;
while ((str = br.readLine()) != null) {
sb.append(str);
}
br.close();
String json = sb.toString();
return JSONObject.parseObject(json, Map.class);
} catch (IOException e) {
e.printStackTrace();
} finally {
if (null != br) {
try {
br.close();
} catch (IOException e) {
e.printStackTrace();
}
}
}
return null;
}
public Map<String, String> readQuery(HttpServletRequest request) {
String queryString = request.getQueryString();
if (queryString != null && !"".equals(queryString)) {
String[] querys = queryString.split("&");
Map<String, String> map = new HashMap<>();
for (String query : querys) {
String[] q = query.split("=");
map.put(q[0], q[1]);
}
map.remove(FindConfig.PAGE);
map.remove(FindConfig.SIZE);
map.remove(FindConfig.LIKE);
map.remove(FindConfig.ORDER_BY);
map.remove(FindConfig.FIELD);
map.remove(FindConfig.GROUP_BY);
map.remove(FindConfig.MAX_);
map.remove(FindConfig.MIN_);
return map;
} else {
return new HashMap<>();
}
}
public Map<String, String> readConfig(HttpServletRequest request) {
Map<String, String> map = new HashMap<>();
map.put(FindConfig.PAGE, request.getParameter(FindConfig.PAGE));
map.put(FindConfig.SIZE, request.getParameter(FindConfig.SIZE));
map.put(FindConfig.LIKE, request.getParameter(FindConfig.LIKE));
map.put(FindConfig.ORDER_BY, request.getParameter(FindConfig.ORDER_BY));
map.put(FindConfig.FIELD, request.getParameter(FindConfig.FIELD));
map.put(FindConfig.GROUP_BY, request.getParameter(FindConfig.GROUP_BY));
map.put(FindConfig.MAX_, request.getParameter(FindConfig.MAX_));
map.put(FindConfig.MIN_, request.getParameter(FindConfig.MIN_));
return map;
}
public void importDb(MultipartFile file) throws IOException {
if (file.isEmpty()) {
return;
}
List<Map<String, String>> body = new ArrayList<>();
String fileName = file.getOriginalFilename();
if (fileName == null) {
return;
}
String suffix = fileName.substring(fileName.lastIndexOf(".") + 1);
InputStream ins = file.getInputStream();
Workbook wb = null;
if (suffix.equals("xlsx")) {
wb = new XSSFWorkbook(ins);
} else {
wb = new HSSFWorkbook(ins);
}
Sheet sheet = wb.getSheetAt(0);
if (null != sheet) {
for (int line = 0; line <= sheet.getLastRowNum(); line++) {
Row row = sheet.getRow(line);
if (null == row) {
continue;
}
Iterator<Cell> cellIterator = row.cellIterator();
StringBuffer sql = new StringBuffer("INSERT INTO ").append(table).append(" VALUES (null,");
while (cellIterator.hasNext()) {
sql.append(cellIterator.next().getStringCellValue()).append(",");
}
sql.deleteCharAt(sql.length());
sql.append(")");
runCountSql(sql.toString());
}
}
}
public HSSFWorkbook exportDb(Map<String, String> query, Map<String, String> config) {
Query select = select(query, config);
List<Map<String, String>> resultList = select.getResultList();
HSSFWorkbook workbook = new HSSFWorkbook();
HSSFSheet sheet = workbook.createSheet(table);
HSSFCellStyle headerStyle = workbook.createCellStyle();
headerStyle.setFillForegroundColor(IndexedColors.YELLOW.index);
headerStyle.setFillPattern(FillPatternType.SOLID_FOREGROUND);
for (int i = 0; i < resultList.size(); i++) {
HSSFRow row = sheet.createRow(i);
Map<String, String> map = resultList.get(i);
int j = 0;
for (Map.Entry<String, String> entry : map.entrySet()) {
row.createCell(j).setCellValue(new HSSFRichTextString(entry.getValue()));
}
}
return workbook;
}
@Transactional
public void save(E e) {
String s = JSONObject.toJSONString(e);
Map map = JSONObject.parseObject(s, Map.class);
insert(map);
}
public E findOne(Map<String, String> map) {
try {
Query select = select(map, new HashMap<>());
return (E) select.getSingleResult();
} catch (Exception e) {
return null;
}
}
public String encryption(String plainText) {
String re_md5 = new String();
try {
MessageDigest md = MessageDigest.getInstance("MD5");
md.update(plainText.getBytes());
byte b[] = md.digest();
int i;
StringBuffer buf = new StringBuffer("");
for (int offset = 0; offset < b.length; offset++) {
i = b[offset];
if (i < 0)
i += 256;
if (i < 16)
buf.append("0");
buf.append(Integer.toHexString(i));
}
re_md5 = buf.toString();
} catch (Exception e) {
e.printStackTrace();
}
return re_md5;
}
public JSONObject covertObject(JSONObject object) {
if (object == null) {
return null;
}
JSONObject newObject = new JSONObject();
Set<String> set = object.keySet();
for (String key : set) {
Object value = object.get(key);
if (value instanceof JSONArray) {
//数组
value = covertArray(object.getJSONArray(key));
} else if (value instanceof JSONObject) {
//对象
value = covertObject(object.getJSONObject(key));
}
//这个方法自己写的改成下划线
key = humpToLine(key);
newObject.put(key, value);
}
return newObject;
}
public JSONArray covertArray(JSONArray array) {
if (array == null) {
return null;
}
JSONArray newArray = new JSONArray();
for (int i = 0; i < array.size(); i++) {
Object value = array.get(i);
if (value instanceof JSONArray) {
//数组
value = covertArray(array.getJSONArray(i));
} else if (value instanceof JSONObject) {
//对象
value = covertObject(array.getJSONObject(i));
}
newArray.add(value);
}
return newArray;
}
}
使用
package com.project.demo.controller;
import com.project.demo.entity.Article;
import com.project.demo.service.ArticleService;
import com.project.demo.controller.base.BaseController;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;
/**
* 文章：用于内容管理系统的文章(Article)表控制层
*
*/
@RestController
@RequestMapping("article")
public class ArticleController extends BaseController<Article, ArticleService> {
/**
* 服务对象
*/
@Autowired
public ArticleController(ArticleService service) {
setService(service);
}
}
使用Mapper的BaseController, BaseService, BaseEntity
移步 https://www.cnblogs.com/c-lover/p/11380912.html
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