SpringMVC如何實現restful介面
阿新 • • 發佈：2019-01-24
今天看一個SpringMVC的專案，然後編寫介面，並通過前臺的ajax呼叫來訪問介面，當然這所有的一切好像都沒有什麼問題，你看下面是我們的ajax，
function sendMessage() { var curPath=window.document.location.href; var pathName=window.document.location.pathname; var pos=curPath.indexOf(pathName); var localhostPaht=curPath.substring(0,pos); var projectName=pathName.substring(0,pathName.substr(1).indexOf('/')+1); var params={ "name":"wangdneggao" } var json = JSON.stringify(params); $.ajax({ url : localhostPaht + projectName+"/demo/index", data:json, type : 'post', contentType : 'application/json;charset=utf-8', success : function(data) { console.log(data); }, error : function(error) { console.log('介面不通' + error); } }); } sendMessage();
呼叫後臺的demo/index這個介面，但是訪問了半天可以總是提示404
如下:
出現這樣的結果當然是讓人和頭疼的因為這個問題，我除錯一天，工程重新搭建，重新搭建，就這樣
但是到最後的時刻，問題還是解決了，讓人還是能看到一些生活的希望
聽說SpringMVC的配置很重要，那麼我們首先從pom.xml檔案說起:
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <groupId>com.wdg.SqzpAdmin</groupId> <artifactId>SqzpAdmin</artifactId> <version>0.0.1-SNAPSHOT</version> <packaging>war</packaging> <build> <finalName>SqzpAdmin</finalName> <plugins> <plugin> <groupId>org.apache.tomcat.maven</groupId> <artifactId>tomcat7-maven-plugin</artifactId> <version>2.1</version> <configuration> <path>/SqzpAdmin</path> <port>8080</port> <uriEncoding>UTF-8</uriEncoding> <server>tomcat7</server> </configuration> </plugin> <plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-compiler-plugin</artifactId> <version>3.0</version> <configuration> <source>1.7</source> <target>1.7</target> </configuration> </plugin> </plugins> </build> <properties> <spring.version>4.0.5.RELEASE</spring.version> </properties> <dependencies> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-core</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-context</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-jdbc</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-web</artifactId> <version>${spring.version}</version> </dependency> <dependency> <groupId>org.springframework</groupId> <artifactId>spring-webmvc</artifactId> <version>${spring.version}</version> </dependency> <!-- https://mvnrepository.com/artifact/log4j/log4j --> <dependency> <groupId>log4j</groupId> <artifactId>log4j</artifactId> <version>1.2.17</version> </dependency> <!-- https://mvnrepository.com/artifact/com.alibaba/fastjson --> <dependency> <groupId>com.alibaba</groupId> <artifactId>fastjson</artifactId> <version>1.2.47</version> </dependency> </dependencies> </project>
上面是一個非常簡單的SpringMVC，裡面用到的使用到的依賴都是最為基礎的依賴，那麼下下面是web.xml
當然僅僅配置一個轉發器就行了:
<?xml version="1.0" encoding="UTF-8"?> <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" version="2.5"> <display-name>SqzpAdmin</display-name> <servlet> <servlet-name>springMVC</servlet-name> <servlet-class>org.springframework.web.servlet.DispatcherServlet</servlet-class> </servlet> <servlet-mapping> <servlet-name>springMVC</servlet-name> <url-pattern>/</url-pattern> </servlet-mapping> <welcome-file-list> <welcome-file>index.html</welcome-file> </welcome-file-list> </web-app>
這些都配置好了之後要做的事情是：SpringMVC-servlet.xml
<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:p="http://www.springframework.org/schema/p"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:util="http://www.springframework.org/schema/util" xmlns:mvc="http://www.springframework.org/schema/mvc"
xsi:schemaLocation="
http://www.springframework.org/schema/beans
http://www.springframework.org/schema/beans/spring-beans-4.2.xsd
http://www.springframework.org/schema/util
http://www.springframework.org/schema/util/spring-util-4.2.xsd
http://www.springframework.org/schema/context
http://www.springframework.org/schema/context/spring-context-4.2.xsd
http://www.springframework.org/schema/mvc
http://www.springframework.org/schema/mvc/spring-mvc-4.2.xsd">
<!-- 解決中文亂碼 -->
<mvc:annotation-driven>
<mvc:message-converters register-defaults="true">
<bean class="org.springframework.http.converter.StringHttpMessageConverter">
<property name="supportedMediaTypes">
<list>
<value>text/plain;charset=UTF-8</value>
<value>text/html;charset=UTF-8</value>
<value>application/json;charset=UTF-8</value>
</list>
</property>
</bean>
</mvc:message-converters>
</mvc:annotation-driven>
<bean id="utf8Charset" class="java.nio.charset.Charset"
factory-method="forName">
<constructor-arg value="UTF-8" />
</bean>
<bean class="org.springframework.web.servlet.mvc.HttpRequestHandlerAdapter" />
<bean
class="org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter" />
<bean
class="org.springframework.web.servlet.view.InternalResourceViewResolver">
<property name="prefix" value="/WEB-INF/" />
</bean>
<!-- 靜態資源處理 -->
<mvc:default-servlet-handler />
<mvc:annotation-driven />
<context:component-scan base-package="com.wdg.controller"></context:component-scan>
</beans>還有一個是controller:
package com.wdg.controller;
import java.io.IOException;
import org.apache.log4j.Logger;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;
import com.wdg.util.BuildJsonOfObject;
@Controller
@RequestMapping("/demo")
public class DemoController {
private Logger log;
public DemoController() {
this.log = Logger.getLogger(this.getClass());
}
@RequestMapping("/index")
public String index(@RequestBody String params) {
log.info("-----------------開始addcomment------------------------------------");
log.info("-----------------結束addcomment------------------------------------");
return BuildJsonOfObject.buildJsonOfString("demo");
}
@RequestMapping(value = "/addcomment", produces = "application/json; charset=utf-8")
public @ResponseBody String addComment(@RequestBody String params) throws IOException {
log.info("-----------------開始addcomment------------------------------------");
log.info("-----------------結束addcomment------------------------------------");
return params;
}
}上面就是簡單的工程了，但是訪問一直出現404，原因是因為我們需要在介面的前面加上:@ResponseBody 這個註釋，問題就解決了，希望對你有所幫助