[英]Not able to send JSON object to Ajax from Jersey REST web service
[英]How can I send a JSON object with Jersey in a Rest Service
我正在嘗試使用jersey提供寧靜的服務,因為我正在將jersey示例用於maven項目。 這就是我得到的:
我的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/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.example</groupId>
<artifactId>simple-service-webapp</artifactId>
<packaging>war</packaging>
<version>1.0-SNAPSHOT</version>
<name>simple-service-webapp</name>
<build>
<finalName>simple-service-webapp</finalName>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>2.5.1</version>
<inherited>true</inherited>
<configuration>
<source>1.7</source>
<target>1.7</target>
</configuration>
</plugin>
</plugins>
</build>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>org.glassfish.jersey</groupId>
<artifactId>jersey-bom</artifactId>
<version>${jersey.version}</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
<dependencies>
<dependency>
<groupId>org.glassfish.jersey.containers</groupId>
<artifactId>jersey-container-servlet-core</artifactId>
<!-- use the following artifactId if you don't need servlet 2.x compatibility -->
<!-- artifactId>jersey-container-servlet</artifactId -->
</dependency>
<!-- uncomment this to get JSON support <dependency> <groupId>org.glassfish.jersey.media</groupId>
<artifactId>jersey-media-moxy</artifactId> </dependency> -->
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>servlet-api</artifactId>
<version>2.5</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>javax.servlet.jsp</groupId>
<artifactId>jsp-api</artifactId>
<version>2.1</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>javax.servlet</groupId>
<artifactId>jstl</artifactId>
<version>1.2</version>
</dependency>
<dependency>
<groupId>com.fasterxml.jackson.jaxrs</groupId>
<artifactId>jackson-jaxrs-json-provider</artifactId>
<version>2.6.0</version>
</dependency>
</dependencies>
<properties>
<jersey.version>2.19</jersey.version>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
</project>
我的web.xml:
<?xml version="1.0" encoding="UTF-8"?>
<!-- This web.xml file is not required when using Servlet 3.0 container,
see implementation details http://jersey.java.net/nonav/documentation/latest/jax-rs.html -->
<web-app version="2.5" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
<servlet>
<servlet-name>Jersey Web Application</servlet-name>
<servlet-class>org.glassfish.jersey.servlet.ServletContainer</servlet-class>
<init-param>
<param-name>jersey.config.server.provider.packages</param-name>
<param-value>com.example</param-value>
</init-param>
<load-on-startup>1</load-on-startup>
</servlet>
<servlet-mapping>
<servlet-name>Jersey Web Application</servlet-name>
<url-pattern>/webapi/*</url-pattern>
</servlet-mapping>
</web-app>
資源
package com.example;
import javax.ws.rs.GET;
import javax.ws.rs.Path;
import javax.ws.rs.PathParam;
import javax.ws.rs.Produces;
import javax.ws.rs.core.MediaType;
/**
* Root resource (exposed at "myresource" path)
*/
@Path("/myresource")
public class MyResource {
/**
* Method handling HTTP GET requests. The returned object will be sent
* to the client as "text/plain" media type.
*
* @return String that will be returned as a text/plain response.
*/
@GET
@Produces(MediaType.TEXT_PLAIN)
public String getIt() {
return "Got it!";
}
@Path( "complexObject/{name}" )
@GET
@Produces( { MediaType.APPLICATION_JSON } )
public ComplexObject complexObject( @PathParam( "name" ) String name ) {
return new ComplexObject(name);
}
}
ComplexObject類只是帶有字符串的類。 當我點擊url時: http:// localhost:8080 / simple-service-webapp / webapi / myresource /這項工作,我得到“知道了!”
但是當我點擊時: http:// localhost:8080 / simple-service-webapp / webapi / myresource / complexObject / capo
我在控制台上收到此錯誤:
嚴重:找不到媒體類型= application / json,類型= class com.example.ComplexObject,genericType = class com.example.ComplexObject的MessageBodyWriter。
我怎樣才能解決這個問題?
有了這種依賴
<dependency>
<groupId>com.fasterxml.jackson.jaxrs</groupId>
<artifactId>jackson-jaxrs-json-provider</artifactId>
<version>2.6.0</version>
</dependency>
您仍然需要注冊提供商。 您可以單獨注冊
<init-param>
<param-name>jersey.config.server.provider.classnames</param-name>
<param-value>
com.fasterxml.jackson.jaxrs.json.JacksonJaxbJsonProvider
</param-value>
</init-param>
或者,因為依賴項也隨Jackson ExceptionMappers一起提供,所以您可能只想掃描整個軟件包(只需將其添加到軟件包列表中即可)
<init-param>
<param-name>jersey.config.server.provider.packages</param-name>
<param-value>
com.example,
com.fasterxml.jackson.jaxrs.json
</param-value>
</init-param>
除了使用上述依賴項之外,另一種選擇是使用Jersey的“包裝器”依賴項(用於處理提供者的注冊,以及諸如Jackson Entity Filtering之類的其他事項。)
<dependency>
<groupId>org.glassfish.jersey.media</groupId>
<artifactId>jersey-media-json-jackson</artifactId>
</dependency>
在這種依賴性下,需要進行注冊。 通過Jersey的自動發現功能自動注冊
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