Question

springmvc加json加ajax要怎么配置

Answer 1

加入对springmvc需要jackson支持包的引入
<dependency> <groupId>com.fasterxml.jackson.core</groupId> <artifactId>jackson-databind</artifactId> <version>2.6.3</version></dependency><dependency> <groupId>com.fasterxml.jackson.core</groupId> <artifactId>jackson-core</artifactId> <version>2.6.3</version></dependency><dependency> <groupId>com.fasterxml.jackson.core</groupId> <artifactId>jackson-annotations</artifactId> <version>2.6.3</version></dependency>
不引入支持包，在debug下，spring会抛出异常
配置spring-servlet.xml
<bean class="org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter">
<property name="messageConverters">
<list>
<ref bean="mappingJackson2HttpMessageConverter" />
</list>
</property>
</bean>
<bean id="mappingJackson2HttpMessageConverter" class="org.springframework.http.converter.json.MappingJackson2HttpMessageConverter">
<property name="supportedMediaTypes">
<list>
<value>text/html;charset=UTF-8</value>
<value>text/json;charset=UTF-8</value>
<value>application/json;charset=UTF-8</value>
</list>
</property>
</bean>
具体使用方法：
使用注解@ResponseBody可以将结果（一个包含字符串和JavaBean的Map），转换成JSON。 使用 @RequestBody 注解前台只需要向 Controller 提交一段符合格式的 JSON，Spring 会自动将其拼装成 bean。
ajax json前端请求示例
jQuery.ajax( {
type : 'GET',
contentType : 'application/json',
url : 'user/list',
dataType : 'json',
success : function(data) {
if (data && data.success == "true") {
$('#info').html("共" + data.total + "条数据。<br/>");
$.each(data.data, function(i, item) {
$('#info').append(
"编号：" + item.id + "，姓名：" + item.username
+ "，年龄：" + item.age);
});
}
},
error : function() {
alert("error")
}
});
后台java controller类
@Controller
@RequestMapping("/user")
public class DemoController {

@RequestMapping(value = "/list", method = RequestMethod.GET)
@ResponseBody
public Map<String, Object> getUserList() {
logger.info("列表");
List<UserModel> list = new ArrayList<UserModel>();
UserModel um = new UserModel();
um.setId("1");
um.setUsername("sss");
um.setAge(222);
list.add(um);
Map<String, Object> modelMap = new HashMap<String, Object>(3);
modelMap.put("total", "1");
modelMap.put("data", list);
modelMap.put("success", "true");
return modelMap;
}
}