Question

我正在搜索使用JSON和RESTful示例时发生的这个问题，但我找不到任何东西。这是我的代码：

@Path("students")
public class StudentResource {
private StudentRepository studentRepository = new StudentRepositoryStub();

@GET
@Produces(MediaType.APPLICATION_JSON)
public List<Student> getallStudentList() {
    return studentRepository.findAllStudents();
}

}

这是web.xml：

<servlet>
    <servlet-name>Example API</servlet-name>
    <servlet-class>com.sun.jersey.spi.container.servlet.ServletContainer</servlet-class>
    <init-param>
        <param-name>com.sun.jersey.api.json.POJOMappingFeature</param-name>
        <param-value>true</param-value>
    </init-param>

</servlet>
<servlet-mapping>
    <servlet-name>Example API</servlet-name>
    <url-pattern>/*</url-pattern>
</servlet-mapping>

并且pom文件是：

<?xml version="1.0" encoding="UTF-8"?>
<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>groupId</groupId>
<artifactId>untitled67</artifactId>
<version>1.0-SNAPSHOT</version>
<packaging>war</packaging>


<dependencies>

    <dependency>
        <groupId>com.sun.jersey</groupId>
        <artifactId>jersey-server</artifactId>
        <version>1.2</version>
    </dependency>

    <dependency>
        <groupId>com.fasterxml.jackson.core</groupId>
        <artifactId>jackson-databind</artifactId>
        <version>2.6.3</version>
    </dependency>

    <dependency>
        <groupId>com.sun.jersey</groupId>
        <artifactId>jersey-json</artifactId>
        <version>1.8</version>
    </dependency>

</dependencies>

最后这是学生班：

@XmlRootElement
public class Student {
private String name;
private int age;

public String getName() {
    return name;
}

public void setName(String name) {
    this.name = name;
}

public int getAge() {
    return age;
}

public void setAge(int age) {
    this.age = age;
}
}

学生班充满了：

public class StudentRepositoryStub implements StudentRepository {

public List<Student> findAllStudents() {
    List<Student> studentList = new ArrayList<Student>();

    Student student = new Student();
    student.setName("jamshid");
    student.setAge(22);

    studentList.add(student);

    student.setName("saeid");
    student.setAge(26);
    studentList.add(student);

    return studentList;

}
}

当我使用

时

MediaType.APPLICATION_JSON

而不是

MediaType.APPLICATION_XML

发生此错误：

javax.ws.rs.WebApplicationException：HTTP 500内部服务器错误 at com.sun.jersey.spi.container.ContainerResponse.write（ContainerResponse.java:267） at com.sun.jersey.server.impl.application.WebApplicationImpl._handleRequest（WebApplicationImpl.java:1035） at com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest（WebApplicationImpl.java:947） at com.sun.jersey.server.impl.application.WebApplicationImpl.handleRequest（WebApplicationImpl.java:938）在com.sun.jersey.spi.container.servlet.WebComponent.service（WebComponent.java:399）在com.sun.jersey.spi.container.servlet.ServletContainer.service（ServletContainer.java:478）在com.sun.jersey.spi.container.servlet.ServletContainer.service（ServletContainer.java:663）在javax.servlet.http.HttpServlet.service（HttpServlet.java:728）在org.apache.catalina.core.ApplicationFilterChain.internalDoFilter（ApplicationFilterChain.java:303）在org.apache.catalina.core.ApplicationFilterChain.doFilter（ApplicationFilterChain.java:208）在org.apache.tomcat.websocket.server.WsFilter.doFilter（WsFilter.java:51）在org.apache.catalina.core.ApplicationFilterChain.internalDoFilter（ApplicationFilterChain.java:241）在org.apache.catalina.core.ApplicationFilterChain.doFilter（ApplicationFilterChain.java:208）在org.apache.catalina.core.StandardWrapperValve.invoke（StandardWrapperValve.java:221）在org.apache.catalina.core.StandardContextValve.invoke（StandardContextValve.java:107）在org.apache.catalina.authenticator.AuthenticatorBase.invoke（AuthenticatorBase.java:504）在org.apache.catalina.core.StandardHostValve.invoke（StandardHostValve.java:155）在org.apache.catalina.valves.ErrorReportValve.invoke（ErrorReportValve.java:76）在org.apache.catalina.valves.AccessLogValve.invoke（AccessLogValve.java:934）在org.apache.catalina.core.StandardEngineValve.invoke（StandardEngineValve.java:90）在org.apache.catalina.connector.CoyoteAdapter.service（CoyoteAdapter.java:515）在org.apache.coyote.http11.AbstractHttp11Processor.process（AbstractHttp11Processor.java:1012） at org.apache.coyote.AbstractProtocol $ AbstractConnectionHandler.process（AbstractProtocol.java:642）在org.apache.coyote.http11.Http11NioProtocol $ Http11ConnectionHandler.process（Http11NioProtocol.java:223）在org.apache.tomcat.util.net.NioEndpoint $ SocketProcessor.doRun（NioEndpoint.java:1597）在org.apache.tomcat.util.net.NioEndpoint $ SocketProcessor.run（NioEndpoint.java:1555）在java.util.concurrent.ThreadPoolExecutor.runWorker（ThreadPoolExecutor.java:1142） at java.util.concurrent.ThreadPoolExecutor $ Worker.run（ThreadPoolExecutor.java:617）在java.lang.Thread.run（Thread.java:745）

我不知道为什么！它只是作为XML工作！请帮助我tnx。

Answer 1

您需要做的两件事就是

更改@Produces（“application / json”）
路径始终应从@Path（“/ students”）
添加依赖

<dependency> <groupId>org.eclipse.persistence</groupId> <artifactId>org.eclipse.persistence.moxy</artifactId> <version>2.6.0</version> </dependency>

阅读文档以获取更多详细信息：http://docs.oracle.com/javaee/6/tutorial/doc/gilik.html

使用

1 个答案: