javaScript中内置了一个JSON对象，可以用来进行json与字符串之间的转换
json转换成字符串：使用JSON.stringify()
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| let userArr = [
{
userId:1,
userName:'张三',
userSex:'男'
},{
userId:2,
userName:'李四',
userSex:'女'
},{
userId:3,
userName:'王五',
userSex:'男'
}
]
let str = JSON.stringify(userArr);
console.log(str);
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字符串转换成json：使用JSON.parse()
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| let userArr = [
{
userId:1,
userName:'张三',
userSex:'男'
},{
userId:2,
userName:'李四',
userSex:'女'
},{
userId:3,
userName:'王五',
userSex:'男'
}
]
let str = JSON.stringify(userArr);
let new_user = JSON.parse(str);
console.log(new_user);
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java对象转化为json格式字符串数据返回到前端页面
JsonModel.java
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| package com.lan.utils;
public class JsonModel<T>{
private int code;
private String msg;
private long total;
private T rows;
public int getCode() {
return code;
}
public void setCode(int code) {
this.code = code;
}
public String getMsg() {
return msg;
}
public void setMsg(String msg) {
this.msg = msg;
}
public long getTotal() {
return total;
}
public void setTotal(long total) {
this.total = total;
}
public T getRows() {
return rows;
}
public void setRows(T rows) {
this.rows = rows;
}
}
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JsonUtil.java
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| package com.lan.utils;
import com.alibaba.fastjson.JSONObject;
public class JsonUtil {
public static String toJSONString(Object obj) {
return JSONObject.toJSONString(obj);
}
}
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controller层返回json数据 —— servlet测试
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public void allUserInfo(HttpServletRequest request, HttpServletResponse response) throws SQLException, IOException {
List<User> list = userService.SelectAllUserServlet();
JsonModel<List<User>> jsonModel = new JsonModel<>();
if(list==null) {
jsonModel.setCode(0);
jsonModel.setMsg("error...");
}else {
jsonModel.setCode(1);
jsonModel.setMsg("success...");
jsonModel.setRows(list);
jsonModel.setTotal(list.size());
}
response.getWriter().println(JsonUtil.toJSONString(jsonModel.getRows()));
}
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