[Java] SpringMVC接收与响应json数据的几种方式

<!-- jackson依赖 -->
<dependency>
 <groupid>com.fasterxml.jackson.core</groupid>
 <artifactid>jackson-core</artifactid>
 <version>2.7.0</version>
</dependency>
<dependency>
 <groupid>com.fasterxml.jackson.core</groupid>
 <artifactid>jackson-databind</artifactid>
 <version>2.7.0</version>
</dependency>
<dependency>
 <groupid>com.fasterxml.jackson.core</groupid>
 <artifactid>jackson-annotations</artifactid>
 <version>2.7.0</version>
</dependency>

<button >点我</button>
<script>
 function clickme() {
  $.ajax({
   type : 'post',
   url : "acceptjsonbyentity",
   contenttype : "application/json;charset=utf-8",
   // 如果想以json格式把数据提交到后台的话，json.stringify()必须有，否则只会当做表单提交
   data : json.stringify({
  "bookid" : 1,
  "author" : "jack"
   }),
   // 期待返回的数据类型
   datatype : "json",
   success : function(data) {
  var bookid = data.bookid;
  var author = data.author;
  alert("success:" + bookid+','+author);
   },
   error : function(data) {
  alert("error" + data);
   }
  });
</script>

@controller
public class passjsonparam {
 @requestmapping(value="acceptjsonbyentity",method = requestmethod.post)
 @responsebody
 public book acceptjsonbyentity(@requestbody book book, httpservletrequest request){
  system.out.println("当前http请求方式为:"+request.getmethod());
  system.out.println("bookid="+book.getbookid()+", author="+book.getauthor());
  return book;
 }
}

如果controller中的所有方法都需要返回json格式数据，可以使用@restcontroller注解。
@restcontroller = @controller + @responsebody

@restcontroller
public class passjsonparam {
 @requestmapping(value="acceptjsonbyentity",method = requestmethod.post)
 public book acceptjsonbyentity(@requestbody book book, httpservletrequest request){
  system.out.println("当前http请求方式为:"+request.getmethod());
  system.out.println("bookid="+book.getbookid()+", author="+book.getauthor());
  return book;
 }
}

<form id="bookform">
 <input type="text" name="bookname" id="bookname">
 <input type="text" name="author" id="author" >
 <button >提交</button>
</form>
 
<script>
 function submitform(event) {
  //阻止form默认事件
  event.preventdefault();
  //得到搜索框数据
  var map = new map();
  $("#bookform input").each(function () {
   var value = $(this).val();  //input 值
   var name = $(this).attr('name');
   map.set(name,value);
  })
 
  //map转为json的方法
  var obj= object.create(null);
  for (var [k,v] of map) {
   obj[k] = v;
  }
 
  $.ajax({
   type: 'post',
   contenttype:'application/json',
   url: "acceptjsonbymap",
   data: json.stringify(obj),
   datatype: 'json',
   success: function (data) {
  var bookname = data.bookname;
  var author = data.author;
  alert("bookname ="+bookname+"; author="+author);
   },
   error: function (data) {
  alert("失败啦");
   }
  });
 }
</script>

@requestmapping(value="acceptjsonbymap")
@responsebody
public map<string,object> acceptjsonbymap(@requestbody map<string,object> paramsmap, httpservletrequest request){
 system.out.println("当前http请求方式为:"+request.getmethod());
 system.out.println(paramsmap);
 return paramsmap;
}

<button >clickhere</button>
<script>
 function clickhere() {
  var params1 = {
   "bookid":"123",
   "author":"rose"
  };
  var params2 = {
   "bookid":"321",
   "author":"jack"
  };
  var list = [];
  list.push(params1);
  list.push(params2);
 
  $.ajax({
   type: 'post',
   contenttype:'application/json',
   url: "acceptjsonbylist",
   data: json.stringify(list),
   datatype: 'json',
   success: function (data) {
  for (let i = 0; i < data.length; i++) {
   var bookid = data[i].bookid;
   var author = data[i].author;
   alert("bookid ="+bookid+"; author="+author);
  }
   },
   error: function (data) {
  alert("失败啦");
   }
  });
 }
</script>

@requestmapping(value="acceptjsonbylist")
@responsebody
public list<book> acceptjsonbylist(@requestbody list<book> book, httpservletrequest request){
 system.out.println("当前http请求方式为:"+request.getmethod());
 system.out.println(book);
 return book;
}