ajax傳遞list集合

一：ajax傳遞List類型的數據
js代碼：

//聲明list  
var _list = [];  
//放入string對象  
for (var i = 0; i < 3; i++) {  
    _list[i]="tom";  
}  
  
$.ajax({  
    url : '/ajax/test',  
    data : "list="+_list,  
    type : "POST",  
    success : function(data) {  
        alert(data);  
    }  
});  

java代碼：

@RequestMapping(value="test",method=RequestMethod.POST)  
@ResponseBody  
public String ajaxList(@RequestParam("list")List<String> strList){  
          
    for (String str : strList) {  
        System.out.println(str);  
    }  
    return "OK";  
}  

二：ajax傳遞List類型的數據
後臺需要用到json解析工具，我選得是jackson
導入jackson依賴：

<dependency>  
    <groupId>com.fasterxml.jackson.core</groupId>  
    <artifactId>jackson-databind</artifactId>  
    <version>2.7.3</version>  
</dependency> 

js代碼：

 //聲明list  
var _list = [];  
//創建兩個user對象  
var a= {};  
a.name="tom";  
a.age=23;  
a.city="上海";  
var b = {};  
b.name="jack";  
b.age=25;  
a.city="安徽";  
//將user放入_list  
_list.push(a);  
_list.push(b);  
  
$.ajax({  
    url : '/ajax/test1',  
    data : "list="+JSON.stringify(_list),  
    type : "POST",  
    success : function(data) {  
        alert(data);  
    }  
});  

java代碼：

@RequestMapping(value="test",method=RequestMethod.POST)  
@ResponseBody  
public String ajaxList(@RequestParam("list")String userList) throws Exception{  
    //jackson對象  
    ObjectMapper mapper = new ObjectMapper();  
    //使用jackson將json轉爲List<User>  
    JavaType jt = mapper.getTypeFactory().constructParametricType(ArrayList.class, User.class);     
    List<User> list =  (List<User>)mapper.readValue(userList, jt);  
          
    return "OK";  
}  

三：當ajax傳遞任何複雜參數時，後臺可以直接從流中來讀取數據進行解析
js代碼：

//聲明list  
var _list = [];  
//創建兩個user對象  
var a= {};  
a.name="tom";  
a.age=23;  
a.city="上海";  
var b = {};  
b.name="jack";  
b.age=25;  
a.city="安徽";  
//將user放入_list  
_list.push(a);  
_list.push(b);  
  
$.ajax({  
    url : '/querz/test',  
    data : JSON.stringify(_list),//這裏需要json化  
    type : "POST",  
    success : function(data) {  
        alert(data);  
    }  
});  

java代碼：

@RequestMapping(value="test",method=RequestMethod.POST)  
@ResponseBody  
public String ajaxList(HttpServletRequest request) throws Exception{  
      
    //從流中讀取數據  
    BufferedReader br = request.getReader();  
    String str = "";  
    StringBuffer sb = new StringBuffer();  
    while((str = br.readLine()) != null){  
        sb.append(str);  
    }  
          
    ObjectMapper mapper = new ObjectMapper();  
    //使用jackson解析數據  
    JavaType jt = mapper.getTypeFactory().constructParametricType(ArrayList.class, User.class);     
    List<User> list =  (List<User>)mapper.readValue(sb.toString(), jt);   
    System.out.println(list);  
          
    return "OK";  
}