一:ajax传递List<String>类型的数据
js代码:
//声明list
var _list = [];
//放入string对象
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代码:
@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";
}
后台需要用到json解析工具,我选得是jackson
导入jackson依赖:
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>2.7.3</version>
</dependency>
js代码:
//声明list
var _list = [];
//创建两个user对象
var a= {};
a.name="tom";
a.age=23;
a.city="上海";
var b = {};
b.name="jack";
b.age=25;
a.city="安徽";
//将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);
}
});
@RequestMapping(value="test",method=RequestMethod.POST)
@ResponseBody
public String ajaxList(@RequestParam("list")String userList) throws Exception{
//jackson对象
ObjectMapper mapper = new ObjectMapper();
//使用jackson将json转为List<User>
JavaType jt = mapper.getTypeFactory().constructParametricType(ArrayList.class, User.class);
List<User> list = (List<User>)mapper.readValue(userList, jt);
return "OK";
}
三:当ajax传递任何复杂参数时,后台可以直接从流中来读取数据进行解析
js代码:
//声明list
var _list = [];
//创建两个user对象
var a= {};
a.name="tom";
a.age=23;
a.city="上海";
var b = {};
b.name="jack";
b.age=25;
a.city="安徽";
//将user放入_list
_list.push(a);
_list.push(b);
$.ajax({
url : '/querz/test',
data : JSON.stringify(_list),//这里需要json化
type : "POST",
success : function(data) {
alert(data);
}
});
java代码:
@RequestMapping(value="test",method=RequestMethod.POST)
@ResponseBody
public String ajaxList(HttpServletRequest request) throws Exception{
//从流中读取数据
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解析数据
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";
}
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