java gson 工具类_Json解析工具类JsonHelper
利用Gson快速解析json
需要导入Gson包，解析成一个对象或一个包含此对象的list
JsonHelper代码如下：
import java.util.ArrayList;
import java.util.List;
import android.text.TextUtils;
import com.google.gson.Gson;
import com.google.gson.JsonParseException;
import com.google.gson.JsonParser;
import com.google.gson.reflect.TypeToken;
public class JsonHelper {
private static JsonHelper util;
public static JsonHelper getInstance() {
if (util == null) {
util = new JsonHelper();
}
return util;
}
private JsonHelper() {
super();
}
public String createJsonString(Object value) {
Gson gson = new Gson();
String str = gson.toJson(value);
return str;
}
public T getObject(String jsonString, Class cls) {
T t = null;
try {
if (isGoodJson(jsonString)) {
Gson gson = new Gson();
t = gson.fromJson(jsonString, cls);
}
} catch (Exception e) {
e.printStackTrace();
}
return t;
}
public List getList(String jsonString, TypeToken tt) {
List list = new ArrayList();
try {
if (isGoodJson(jsonString)) {
Gson gson = new Gson();
list = gson.fromJson(jsonString, tt.getType());
}
} catch (Exception e) {
}
return list;
}
public boolean isBadJson(String json) {
return !isGoodJson(json);
}
public boolean isGoodJson(String json) {
if (TextUtils.isEmpty(json)) {
return false;
}
try {
new JsonParser().parse(json);
} catch (JsonParseException e) {
return false;
}
return true;
}
}
使用方法
Bean bean = new Bean();
bean.age="30";
bean.name="name";
String result = JsonHelper.getInstance().createJsonString(bean);
System.out.println(result);
Bean bean2 = JsonHelper.getInstance().getObject(result, Bean.class);
System.out.println(bean2.toString());
ArrayList list = new ArrayList();
list.add(bean);
list.add(bean2);
result = JsonHelper.getInstance().createJsonString(list);
System.out.println(result);
List> list2 = JsonHelper.getInstance().getList(result, new TypeToken>(){});
System.out.println(list2.toString());
Bean.java
public class Bean {
String name="";
String age="";
@Override
public String toString() {
return "Bean [name=" + name + ", age=" + age + "]";
}
}