Spring MVC在接收复杂集合参数

  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：

• 接收List<String>集合参数：

1、页面js代码：

  

var idList = new Array();
idList.push(“1”);
idList.push(“2”);
idList.push(“3”);
var isBatch = false;
$.ajax({
    type: "POST",
    url: "<%=path%>/catalog.do?fn=deleteCatalogSchemes",
    dataType: 'json',
    data: {"idList":idList,"isBatch":isBatch},
    success: function(data){
        …
    },
    error: function(res){
        …
    }
});

 

 2、Controller方法：

 

@Controller
@RequestMapping("/catalog.do")
public class CatalogController {

    @RequestMapping(params = "fn=deleteCatalogSchemes")
    @ResponseBody
    public AjaxJson deleteCatalogSchemes(@RequestParam("idList[]") List<String> idList,Boolean isBatch) {
            …
    }
}

 

•  接收List<User>、User[]集合参数：

 1、User实体类：

 

public class User {
        private String name;
    private String pwd;
    //省略getter/setter
}

 

2、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){
        …
    }
});

 

3、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。

• 接收List<Map<String,Object>>集合参数：

 1、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){
        …
    }
});

  

2、Controller方法：

@Controller
@RequestMapping("/catalog.do")
public class CatalogController {

    @RequestMapping(params = "fn=saveUsers")
    @ResponseBody
    public AjaxJson saveUsers(@RequestBody List<Map<String,Object>> listMap) {
        …
    }
}

•  接收User(bean里面包含List)集合参数：

 1、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
}

2、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){
        …
    }
});

  3、Controller方法：

@Controller
@RequestMapping("/catalog.do")
public class CatalogController {

    @RequestMapping(params = "fn=saveUsers")
    @ResponseBody
    public AjaxJson saveUsers(@RequestBody User user) {
        List<User> customers = user.getCustomers();
        …
    }
}