springmvc controller层接收List类型的参数

   Spring MVC在接收集合请求参数时，需要在Controller方法的集合参数里前添加@RequestBody，而@RequestBody默认接收的enctype (MIME编码)是application/json，因此发送POST请求时需要设置请求报文头信息，否则Spring MVC在解析集合请求参数时不会自动的转换成JSON数据再解析成相应的集合。以下列举接收List<String>、List<User>、List<Map<String,Object>>、User[]、User(bean里面包含List)几种较为复杂的集合参数示例：

?

1	<strong>第一种类型：直接接收list <strong>接收List<String>集合参数</strong></strong>

?

1

前台通过ajax传输数据<br><br>    var allFilePaths = new Array();<br>     <br>    for (var i = 0; i < 10; i++) {<br>        allFilePaths.push("xx"+i);<br>    }<br>    $.ajax({  <br>        url : url,<br>        type : 'POST',<br>        dataType: 'json',<br>        contentType: "application/json",   //ajax默认是application/x-www-form-urlencoded  需要注意<br>        data : JSON.stringify(allFilePaths),//转为json格式<br>        success : function(col) {<br>     <br>        }<br>        },<br>        error : function(col){<br>                }<br>    });<br><br>controller层<br><br>    @RequestMapping("/delFileInfo")<br>    @ResponseBody<br>    public void delFileInfo(@RequestBody List<String> macroPath) throws IOException<br>        {<br>     <br>            for(String sPath :macroPath)<br>            {<br>                System.out.println(sPath);<br>            }<br>        }<br><br>

 

第二种类型：把要传递的集合封装成一个List对象或其他，可以达到传递List的目的

?

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36

js层：       Order.delOrders({orderIds: $scope.ids}, function () {          Flash.success('删除成功!');          $state.reload();      });    viewmodel层：       public class ListObj {          private List<String> orderIds ;                  public List<String> getOrderIds() {              return orderIds;          }                  public void setOrderIds(List<String> orderIds) {              this.orderIds = orderIds;          }      }    Controller层：       @RequestMapping(value = "/delOrders")          @ResponseBody          public ViewData deleteOrders(@RequestBody ListObj orderIds, HttpServletRequest request) {                      ViewData viewData = new ViewData();              for (String orderId:orderIds.getOrderIds()){                  System.out.println(orderId);              }              //        String[] arr = orderIds.split(",");      //        ViewData viewData = adminOrderService.deleteOrders(Arrays.asList(arr),getLoginInfo(request));              return viewData;          }

 第三种类型：接收List<User>、User[]集合参数：

?

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41

User实体类：       public class User {              private String name;           private String pwd;          //省略getter/setter      }    页面js代码：       var userList = new Array();      userList.push({name: "李四",pwd: "123"});       userList.push({name: "张三",pwd: "332"});       $.ajax({          type: "POST",          url: "<%=path%>/catalog.do?fn=saveUsers",          data: JSON.stringify(userList),//将对象序列化成JSON字符串          dataType:"json",          contentType : 'application/json;charset=utf-8', //设置请求头信息          success: function(data){              …          },          error: function(res){              …          }      });    Controller方法：       @Controller      @RequestMapping("/catalog.do")      public class CatalogController {                  @RequestMapping(params = "fn=saveUsers")          @ResponseBody          public AjaxJson saveUsers(@RequestBody List<User> userList) {              …          }      }    如果想要接收User[]数组，只需要把saveUsers的参数类型改为@RequestBody User[] userArray就行了。

 
第4种类型：接收List<Map<String,Object>>集合参数：

?

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32

页面js代码（不需要User对象了）：       var userList = new Array();      userList.push({name: "李四",pwd: "123"});       userList.push({name: "张三",pwd: "332"});       $.ajax({          type: "POST",          url: "<%=path%>/catalog.do?fn=saveUsers",          data: JSON.stringify(userList),//将对象序列化成JSON字符串          dataType:"json",          contentType : 'application/json;charset=utf-8', //设置请求头信息          success: function(data){              …          },          error: function(res){              …          }      });    Controller方法：       @Controller      @RequestMapping("/catalog.do")      public class CatalogController {                  @RequestMapping(params = "fn=saveUsers")          @ResponseBody          public AjaxJson saveUsers(@RequestBody List<Map<String,Object>> listMap) {              …          }  <strong>    }  </strong>

 第五种类型：接收User(bean里面包含List)集合参数：

?

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41

User实体类：       public class User {          private String name;           private String pwd;          private List<User> customers;//属于用户的客户群          //省略getter/setter      }    页面js代码：       var customerArray = new Array();      customerArray.push({name: "李四",pwd: "123"});       customerArray.push({name: "张三",pwd: "332"});       var user = {};      user.name = "李刚";      user.pwd = "888";      user. customers = customerArray;      $.ajax({          type: "POST",          url: "<%=path%>/catalog.do?fn=saveUsers",          data: JSON.stringify(user),//将对象序列化成JSON字符串          dataType:"json",          contentType : 'application/json;charset=utf-8', //设置请求头信息          success: function(data){              …          },          error: function(res){              …          }      });      Controller方法：       @Controller      @RequestMapping("/catalog.do")      public class CatalogController {                  @RequestMapping(params = "fn=saveUsers")          @ResponseBody          public AjaxJson saveUsers(@RequestBody User u

 Map<String,Object>  map 类型 

 

 js处理：