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jetbrick-template 杂记(一) SpringMVC, JSR303

干浩然
2023-12-01
自己扩展的函数

import java.lang.reflect.Field;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Locale;
import java.util.Map;
import java.util.Set;

import javax.servlet.http.HttpServletRequest;

import jetbrick.template.JetAnnotations.Functions;
import jetbrick.template.JetContext;
import jetbrick.template.runtime.JetPageContext;
import jetbrick.template.web.JetWebContext;

import org.springframework.context.MessageSource;
import org.springframework.context.NoSuchMessageException;
import org.springframework.validation.BindingResult;
import org.springframework.validation.Errors;
import org.springframework.validation.FieldError;
import org.springframework.validation.ObjectError;
import org.springframework.web.servlet.support.RequestContextUtils;

@Functions
public class SpringFunctions {

private static final List<String> EMPTY_STRING_LIST = Collections.unmodifiableList(new ArrayList<String>());

public static List<String> errors(JetPageContext ctx, String filedName) {
HttpServletRequest request = (HttpServletRequest) ctx.getContext().get(JetWebContext.REQUEST);

Errors errors = findErrors(ctx);
if (errors == null) {
System.out.println("没有找到Errors");
return EMPTY_STRING_LIST;
}

List<FieldError> fes = errors.getFieldErrors(filedName);
List<String> msgs = new ArrayList<String>(0);

for(FieldError fe : fes) {
String[] codes = fe.getCodes();
String defaultMsg = fe.getDefaultMessage();
Object[] args = fe.getArguments();
Locale locale = findLocale(request);
MessageSource ms = findMessageSource(request);

if (codes == null || codes.length == 0 || ms == null) {
msgs.add(defaultMsg);
} else {
String msg = null;
for (int i = 0; i < codes.length; i ++) {
try {
msg = ms.getMessage(codes[i], args, locale);
} catch (NoSuchMessageException e) {
// 忽略
}
if (msg == null) {
msg = defaultMsg;
}
}
msgs.add(msg);
}
}

return Collections.unmodifiableList(msgs);
}

public static List<String> errors(JetPageContext ctx) {
HttpServletRequest request = (HttpServletRequest) ctx.getContext().get(JetWebContext.REQUEST);

Errors errors = findErrors(ctx);
if (errors == null) {
return EMPTY_STRING_LIST;
}

List<ObjectError> oes = errors.getGlobalErrors();
List<String> msgs = new ArrayList<String>(0);

for (ObjectError oe : oes) {
String[] codes = oe.getCodes();
String defaultMsg = oe.getDefaultMessage();
Object[] args = oe.getArguments();
Locale locale = findLocale(request);
MessageSource ms = findMessageSource(request);

if (codes == null || codes.length == 0 || ms == null) {
msgs.add(defaultMsg);
} else {
String msg = null;
for (int i = 0; i < codes.length; i ++) {
try {
msg = ms.getMessage(codes[i], args, locale);
} catch (NoSuchMessageException e) {
// 忽略
}
if (msg == null) {
msg = defaultMsg;
}
}
msgs.add(msg);
}
}
return Collections.unmodifiableList(msgs);
}

@SuppressWarnings("unchecked")
private static Errors findErrors(JetPageContext ctx) {
try {
JetContext jetContext = ctx.getContext();
Field[] fileds = JetContext.class.getDeclaredFields();

Field f = null;
for (Field field : fileds) {
if (field.getName().equals("context")) {
f = field;
break;
}
}

if (f == null) {
return null;
}

f.setAccessible(true);
Map<String, Object> context = (Map<String, Object>) f.get(jetContext);
Set<String> keyset = context.keySet();
String key = null;

for (String k : keyset) {
if (k.startsWith(BindingResult.MODEL_KEY_PREFIX)) {
key = k;
break;
}
}

if (key == null) {
return null;
}

return (Errors) jetContext.get(key);
} catch (Exception e) {
// e.printStackTrace();
}

return null;
}

private static MessageSource findMessageSource(HttpServletRequest request) {
return RequestContextUtils.getWebApplicationContext(request); // WebApplicationContext本身就是MessageSource的实现
}

private static Locale findLocale(HttpServletRequest request) {
return RequestContextUtils.getLocale(request);
}
}


由JSR303标注验证的Bean

public class TestForm implements java.io.Serializable {

private static final long serialVersionUID = 4120123239547893935L;

@NotNull
private Integer id;
@NotNull
@Length(min = 3, max = 12)
private String name;
@NotNull
private Integer age;

// getter & setter
}


Controller

@Controller
public class TestController {

@RequestMapping(value = "/test", method = {RequestMethod.GET})
public String test(@Validated TestForm form, BindingResult br, ModelMap modelMap) {

br.reject(null, "故意加入一个全局错误");
br.reject(null, "另一个全局错误");
br.rejectValue("id", null, "id field的一个由java代码添加的错误");
if (br.hasErrors()) {
return "test";
}
return "ok";
}
}


jetx

<html>
<head>
<base href="${webroot()}" />
<title>错误</title>
</head>

<body>
<h1>ERROR JETX</h1>

<div>
<h3>全局错误</h3>
#set(List<String> gel = errors())
<ul>
#for(String msg : gel)
<li>${msg}</li>
#end
</ul>
</div>

<div>
<h3>Field错误 (id)</h3>
#set(List<String> idMsg = errors("id"))
<ul>
#for(String msg : idMsg)
<li>${msg}</li>
#end
</ul>
</div>

<div>
<h3>Field错误 (name)</h3>
#set(List<String> nameMsg = errors("name"))
<ul>
#for(String msg : nameMsg)
<li>${msg}</li>
#end
</ul>
</div>

<div>
<h3>Field错误 (age)</h3>
#set(List<String> ageMsg = errors("name"))
<ul>
#for(String msg : ageMsg)
<li>${msg}</li>
#end
</ul>
</div>
</body>
</html>
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