Question

在Eclipse中，我创建了动态Web项目，然后配置为Maven。之后，我开发了基本的Rest服务：我添加了一个User类（name，age）和一个html页面以及一个rest服务。为html页面的按钮单击ajax发送请求以停止服务。 Rest服务将用户名和年龄作为json对象返回。但是它确实适用于json。我发生了500错误，但是如果我选择文本或字符串服务成功。我无法解决它，请帮助我让我疯狂:)

我检查了有关Google Pom依赖项或Web xml conf的所有示例。但这不起作用

-- My user class
package main.java.com.json;

public class User {

    private String userName;
    private int userAge;
    public void setUserName(String userName) {
    this.userName = userName;
    }
    public String getUserName() {
    return userName;
    }
    public void setUserAge(int userAge) {
    this.userAge = userAge;
    }
    public int getUserAge() {
    return userAge;
    }
}

-- My rest service
@Path("/RestApiService")
public class RestApiService {

     @GET
     @Produces(MediaType.APPLICATION_JSON)
     @Path("/printFeedback/{var1}/")
     public User printFeedback(@PathParam("var1") String var1) {
      User user = new User();
      user.setUserAge(28);
      user.setUserName("xxx yyy");

      return user;
     }
}

-- my html 
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Insert title here</title>
<script type="text/javascript" src="theme/js/jquery.js"></script>
</head>
<body>
    <input maxlength="6" name="usename" id="userId">
    <button  id="clickBtn">Tıkla</button>

</body>
<script>
    $("#clickBtn").click(function () {
    var  userId=$("#userId").val() ;
    alert("userId" +userId);
     $.ajax({

            url: "./rest/RestApiService/printFeedback/"+userId+"/",
            type: "GET",
            dataType:"json",
            success: function(response) {
                alert("hello");
            },
            error: function() {
                alert("error");
            }
        });
        });
</script>
</html>

---web.xml----

<?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_3_0.xsd" id="WebApp_ID" version="3.0">
  <display-name>RestApiExample</display-name>
  <welcome-file-list>
    <welcome-file>index.html</welcome-file>
    <welcome-file>index.htm</welcome-file>
    <welcome-file>index.jsp</welcome-file>
    <welcome-file>default.html</welcome-file>
    <welcome-file>default.htm</welcome-file>
    <welcome-file>default.jsp</welcome-file>
  </welcome-file-list>
 <servlet>
<servlet-name>Jersey REST Service</servlet-name>
    <servlet-class>
        org.glassfish.jersey.servlet.ServletContainer
    </servlet-class>
<init-param>
<param-name>jersey.config.server.provider.packages</param-name>
<param-value>main.java.com.services</param-value>
</init-param>
<init-param>
<param-name>com.sun.jersey.api.json.POJOMappingFeature</param-name>
<param-value>true</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>Jersey REST Service</servlet-name>
<url-pattern>/rest/*</url-pattern>
</servlet-mapping>
</web-app>

-----pom.xml---
<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>RestApiExample</groupId>
  <artifactId>RestApiExample</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <packaging>war</packaging>
  <build>
    <sourceDirectory>src</sourceDirectory>
    <plugins>
      <plugin>
        <artifactId>maven-compiler-plugin</artifactId>
        <version>3.1</version>
        <configuration>
          <source>1.8</source>
          <target>1.8</target>
        </configuration>
      </plugin>
      <plugin>
        <artifactId>maven-war-plugin</artifactId>
        <version>2.4</version>
        <configuration>
          <warSourceDirectory>WebContent</warSourceDirectory>
          <failOnMissingWebXml>false</failOnMissingWebXml>
        </configuration>
      </plugin>
    </plugins>
  </build>
  <dependencies>
  <dependency>
   <groupId>javax.ws.rs</groupId>
   <artifactId>javax.ws.rs-api</artifactId>
   <version>2.1</version>
  </dependency>
  <dependency>
   <groupId>org.glassfish.jersey.containers</groupId>
   <artifactId>jersey-container-servlet</artifactId>
   <version>2.26</version>
  </dependency>
  <dependency>
   <groupId>org.glassfish.jersey.core</groupId>
   <artifactId>jersey-server</artifactId>
   <version>2.26</version>
  </dependency>
  <dependency>
   <groupId>org.glassfish.jersey.inject</groupId>
   <artifactId>jersey-hk2</artifactId>
   <version>2.26</version>
  </dependency>
  <dependency>
    <groupId>org.json</groupId>
    <artifactId>json</artifactId>
    <version>20090211</version>
</dependency>

<dependency>
<groupId>com.sun.jersey</groupId>
<artifactId>jersey-json</artifactId>
<version>1.6</version>
</dependency>
  </dependencies>
</project>

控制台日志

我的控制台中出现500个间隔服务器错误：严重：MessageBodyWriter 找不到媒体type = application / json，type = class main.java.com.json.User，genericType = class main.java.com.json.User。

为什么当我选择JSON类型时REST服务不起作用

0 个答案: