1. 引入Json依賴
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-databind</artifactId>
<version>2.8.5</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-core</artifactId>
<version>2.8.5</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.core</groupId>
<artifactId>jackson-annotations</artifactId>
<version>2.8.0</version>
</dependency>
2. 加入json解析配置
<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>application/json;charset=UTF-8</value>
<value>text/html;charset=UTF-8</value>
<value>text/json;charset=UTF-8</value>
</list>
</property>
</bean>
3. 前端請求
<body>
<h1>數據請求</h1><hr/>
<input type="text" name="arg1" /><button onclick="arg1Submit()">提交</button>
<h1>數據響應</h1><hr/>
返回數據：<span id="res"></span>
</body>
<script>
function arg1Submit(){
var arg1Val = document.querySelector("input[name=arg1]").value;
console.log(arg1Val);
var json = {"arg1":arg1Val};
var ajax = new XMLHttpRequest();
ajax.open("post","/data/query01");
ajax.setRequestHeader("Content-type","application/json; charset=utf-8");
ajax.send(JSON.stringify(json));
ajax.onreadystatechange = function () {
if (ajax.readyState==4&&ajax.status==200) {
document.querySelector("#res").innerHTML = ajax.responseText;
}
}
}
</script>
4. 後端響應
@RequestMapping("query01")
@ResponseBody
public String query01(@RequestBody Map<String,Object> map){
String result = "這個結果是："+map.get("arg1");
return result;
}
5. 注意事項
a. 使用@ResponseBody註解出現404，需檢查json依賴與配置是否正確。
b. 使用@RequestBody註解出現400，建議使用JSON.stringify方式傳參。
