解決ajax請求(SpringMVC后台)響應415/400/405錯誤

后端代碼

• bean

  
   public class user {
  
       private String username;
  
       private String password;
  
       private Integer age;
  
   //省略get set
  
  }
  

• SpringMVC

  
     	@RequestMapping(value = "testMethod",method = RequestMethod.POST)
            
       @ResponseBody
      
      public String getUser(@RequestBody user u){
      
          System.out.println(u);
  
              return "success";
      }
  
  

415錯誤

沒有設置 contentType: "application/json"

• ajax

  $.ajax({
  
      url:baseurl+"test/testMethod",
     
       type:"POST",
  
      data:JSON.stringify({
  
          "username":"user666",
  
          "password":"a123456",
  
          "age":19
  
      }),
      success:function (res) {
  
          console.log(res);
  
      },
  
          error:function () {
  
          console.log("網絡錯誤");
  
          }
  
      })
  

• 原因

  
  //沒有設置contentType: "application/json",
  
  //更正之后
  
  $.ajax({
  
      url:baseurl+"test/testMethod",
  
      type:"POST",
  
  	contentType: "application/json",
  
      data:JSON.stringify({
  
          "username":"user666",
  
          "password":"a123456",
  
          "age":19
  
      }),
  
      success:function (res) {
  
          console.log(res);
  
      },
  
      error:function () {
  
          console.log("網絡錯誤");
  
      }
  
  })
  
  

400錯誤

沒有對傳輸的內容進行格式化 JSON.stringify(jsonobj)

• ajax

  
  $.ajax({
  
      url:baseurl+"test/testMethod",
  
      type:"POST",
  
  	contentType: "application/json",
  
      data:{
  
          "username":"user666",
  
          "password":"a123456",
  
          "age":19
  
      },
  
      success:function (res) {
  
          console.log(res);
  
      },
  
      error:function () {
  
          console.log("網絡錯誤");
  
      }
  
  })
  

• 原因

  
  //沒有對傳輸的數據進行轉換為JSON字符串JSON.stringify(jsonobj)
  
  //更正之后
  $.ajax({
  
      url:baseurl+"test/testMethod",
  
      type:"POST",
  
  	contentType: "application/json",
  
      data:JSON.stringify({
  
          "username":"user666",
  
          "password":"a123456",
  
          "age":19
  
      }),
  
      success:function (res) {
  
          console.log(res);
  
      },
  
      error:function () {
  
          console.log("網絡錯誤");
  
      }
  
  })
  

405錯誤

通常是type 請求類型設置與后端所限制的請求不一致

• ajax

  
  $.ajax({
  
      url:baseurl+"test/testMethod",
  
      type:"GET",
  
  	contentType: "application/json",
  
      data:JSON.stringify({
  
          "username":"user666",
  
          "password":"a123456",
  
          "age":19
  
      }),
  
      success:function (res) {
  
          console.log(res);
  
      },
  
      error:function () {
          console.log("網絡錯誤");
  
      }
  
      })
  
  

• 原因

  
  //請求類型與后端設置的不一致 正確應為 type:"POST"
  
  //更正之后
  
  $.ajax({
  
      url:baseurl+"test/testMethod",
  
      type:"POST",
  
  	contentType: "application/json",
  
      data:JSON.stringify({
  
          "username":"user666",
  
          "password":"a123456",
  
          "age":19
  
      }),
  
      success:function (res) {
  
          console.log(res);
  
      },
  
      error:function () {
  
          console.log("網絡錯誤");
  
      }
  
  })