Jersey / Atmosphere不能生成JSON
有一个方法返回List，并希望它以JSON的形式发送到客户端。 获取异常“未找到Java类java.util.ArrayList，Java类型java.util.List和MIME媒体类型application / json的消息正文编写器。”
我已经将@XMLRootElement注释添加到我的类声明中，并将POJO映射参数添加到web.xml中，但它不起作用
使用Atmosphere 2.2.3和Atmosphere-Jersey 2.2.3
POM
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>3.8.1</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.atmosphere</groupId>
<artifactId>atmosphere-runtime</artifactId>
<version>2.2.3</version>
</dependency>
<dependency>
<groupId>org.atmosphere</groupId>
<artifactId>atmosphere-jersey</artifactId>
<version>2.2.3</version>
</dependency>
<dependency>
<groupId>javax.xml</groupId>
<artifactId>jaxb-api</artifactId>
<version>2.1</version>
</dependency>
</dependencies>
REST资源：
package com.foo;
import java.util.ArrayList;
import java.util.List;
import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.Produces;
import javax.ws.rs.core.MediaType;
@Path("currencypairs")
@Produces(MediaType.APPLICATION_JSON)
public class CurrencyPairs {
@GET
@Path("foo")
public List<Thing> getPairs() {
List<Thing> ret = new ArrayList<Thing>();
ret.add(new Thing("CAD","USD"));
ret.add(new Thing("EUR", "USD"));
ret.add(new Thing("GBP","EUR"));
return ret;
}
}
事情类：
package com.foo;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;
@XmlRootElement
public class Thing {
@XmlElement
private String a;
@XmlElement
private String b;
public Thing(String a, String b)
{
this.setA(a);
this.setB(b);
}
public String getA() {
return a;
}
public void setA(String a) {
this.a = a;
}
public String getB() {
return b;
}
public void setB(String b) {
this.b = b;
}
}
在web.xml
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:j2ee="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee http://java.sun.com/xml/ns/j2ee/web-app_2.5.xsd">
<description>AtmosphereServlet</description>
<display-name>AtmosphereServlet</display-name>
<context-param>
<param-name>resteasy.scan</param-name>
<param-value>false</param-value>
</context-param>
<context-param>
<param-name>resteasy.scan.providers</param-name>
<param-value>false</param-value>
</context-param>
<context-param>
<param-name>resteasy.scan.resources</param-name>
<param-value>false</param-value>
</context-param>
<servlet>
<description>AtmosphereServlet</description>
<servlet-name>AtmosphereServlet</servlet-name>
<servlet-class>org.atmosphere.cpr.AtmosphereServlet</servlet-class>
<!-- If you want to use Servlet 3.0 -->
<async-supported>true</async-supported>
<!-- List of init-param -->
<init-param>
<param-name>com.sun.jersey.config.property.packages</param-name>
<param-value>com.foo</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>AtmosphereServlet</servlet-name>
<!-- Any mapping -->
<url-pattern>/rest/*</url-pattern>
</servlet-mapping>
</web-app>
将jersey-json-1.6.jar添加到您的依赖项中。
<dependency>
<groupId>com.sun.jersey</groupId>
<artifactId>jersey-json</artifactId>
<version>1.6</version>
</dependency>