在做一個ajax發送json到springmvc的控制層，控制層的對象中有一個List集合，ajax調用總是報415錯誤。發現了一個一直沒有注意到的問題，借機記錄一下。
(細節部分都忽略了，在最後的demo項目位址中會有。這裡隻寫主要的步驟)
一、添加pom.xml依賴
springmvc的pom.xml依賴在demo工程裡都有，這裡主要強調要添加以下兩個依賴，否則@RequestBody和@ResponseBody這兩個注解就不起作用。
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-core</artifactId>
<version>2.5.4</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-annotations</artifactId>
<version>2.5.4</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>2.5.4</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.jaxrs</groupId>
<artifactId>jackson-jaxrs-json-provider</artifactId>
<version>2.5.4</version>
</dependency> 二、Controller層
package org.hope.lee.controller;
import org.hope.lee.model.User;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.servlet.ModelAndView;
import com.alibaba.fastjson.JSONObject;
@Controller
@RequestMapping("/user")
public class UserController {
@RequestMapping("index")
public ModelAndView toAddUserPage() {
return new ModelAndView("addUser");
}
@RequestMapping(value = "/add",method = RequestMethod.POST)
@ResponseBody
public ResponseEntity<String> addUser(@RequestBody User user) {
JSONObject object = new JSONObject();
object.put("success", "成功");
return new ResponseEntity<>(object.toString(), HttpStatus.OK);
}
} 三、JSP頁面
注意"②"處的代碼，這種方式傳遞list參數給controller層種的@RequestBody對象是會報415錯誤的。我發現是因為"②"處addresses的value會多一個雙引号
{"name":"李四","age":"59","gender":"男","addresses":"[{\"addressName\":\"A區\"},{\"addressName\":\"B區\"}]"}。
<%@ page language="java" contentType="text/html; charset=UTF-8"
pageEncoding="UTF-8"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
<script type="text/javascript" src="../static/js/jquery-1.11.0.js"></script>
<script type="text/javascript">
$(document).ready(function() {
$("#btn").click(function() {
var vname = $('#name').val();
var vage = $('#age').val();
var vgender = $("input[name='gender']:checked").val();
var checkedParams = $("input:checkbox:checked");
checked_val = [];
for(k in checkedParams){
if(checkedParams[k].checked)
checked_val.push(checkedParams[k].value);
};
var arr = new Array();
for(var i = 0; i < checked_val.length; i++) {
arr.push({'addressName':checked_val[i]});
}
var arrs = JSON.stringify(arr);
var params = {
name : vname,
age : vage,
gender : vgender,
addresses:arrs
}
var params2 = '{"name":\"'+vname+'\","age":'+vage+',"gender":\"'+vgender+'\","addresses":'+arrs+'}' //如果有更好的辦法，希望給我留言。
console.log("params=" + JSON.stringify(params));
console.log("params2=" + params2);
$.ajax({
url : "add",
type : 'POST',
data : params2, //①
//data:JSON.stringify(params), //②
dataType : 'json',
contentType : "application/json;charset=utf-8",
beforeSend: function() {
},
success : function(data) {
alert("儲存成功");
},
error : function(XMLHttpRequest, textStatus, errorThrown) {
console.log(textStatus + "伺服器異常，請稍後嘗試！");
}
});
});
});
</script>
</head>
<body>
姓名：<input type="text" id="name" /><br/>
年齡：<input type="text" id="age" /><br/>
性别:
男:<input type="radio" checked="checked" name="gender" value="男"/>
女：<input type="radio" name="gender" value="女"/><br/>
位址:
A區<input type="checkbox" id="checkbox" value="A區" />
B區<input type="checkbox" id="checkbox" value="B區" />
C區<input type="checkbox" id="checkbox" value="B區" /><br/>
<button id="btn" >儲存</button>
</body>
</html> https://gitee.com/huayicompany/spring-learn/tree/master/springmvc-json
轉載于:https://www.cnblogs.com/happyflyingpig/p/8425399.html
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