Build RESTful Service 3 with Jersey-convert JAVA object to JSON output

I. General description

XML and JSON are the most common data exchange formats. This example shows how to convert a java object to JSON output.

Ii. Process

1. In the project above,

Add the code in "com. waylau. rest. resources. UserResource". The Code is as follows:

    @GET      @Path("/getUserJson")      @Produces(MediaType.APPLICATION_JSON)      public User getUserJson() {       User user  = new User();       user.setAge("27");       user.setUserId("005");       user.setUserName("Fmand");       return user;      } 

MediaType. APPLICATION_JSON indicates that the output is in JSON format.

2. Run the project and enter http: // localhost: 8089/RestDemo/rest/users/getUserJson in the browser.

Expected to obtain json data. At this time, the project reports an error.

org.glassfish.jersey.message.internal.MessageBodyProviderNotFoundException: MessageBodyWriter not found for media type=application/json, type=class com.waylau.rest.bean.User, genericType=class com.waylau.rest.bean.User.at org.glassfish.jersey.message.internal.WriterInterceptorExecutor$TerminalWriterInterceptor.aroundWriteTo(WriterInterceptorExecutor.java:247)at org.glassfish.jersey.message.internal.WriterInterceptorExecutor.proceed(WriterInterceptorExecutor.java:162)at org.glassfish.jersey.filter.LoggingFilter.aroundWriteTo(LoggingFilter.java:293)at org.glassfish.jersey.message.internal.WriterInterceptorExecutor.proceed(WriterInterceptorExecutor.java:162)at org.glassfish.jersey.server.internal.JsonWithPaddingInterceptor.aroundWriteTo(JsonWithPaddingInterceptor.java:103)at org.glassfish.jersey.message.internal.WriterInterceptorExecutor.proceed(WriterInterceptorExecutor.java:162)at org.glassfish.jersey.server.internal.MappableExceptionWrapperInterceptor.aroundWriteTo(MappableExceptionWrapperInterceptor.java:88)at org.glassfish.jersey.message.internal.WriterInterceptorExecutor.proceed(WriterInterceptorExecutor.java:162)at org.glassfish.jersey.message.internal.MessageBodyFactory.writeTo(MessageBodyFactory.java:1154)at org.glassfish.jersey.server.ServerRuntime$Responder.writeResponse(ServerRuntime.java:571)at org.glassfish.jersey.server.ServerRuntime$Responder.processResponse(ServerRuntime.java:378)at org.glassfish.jersey.server.ServerRuntime$Responder.process(ServerRuntime.java:368)at org.glassfish.jersey.server.ServerRuntime$1.run(ServerRuntime.java:262)

In this case, you need to obtain support for json conversion packages. <喎?http: www.bkjia.com kf ware vc " target="_blank" class="keylink"> VcD4KPHA + v8nS1NPJtuDW1re9yr3Ktc/expires + expires/1tDS/expires + CjxwPjxwcmUgY2xhc3M9 "brush: java;"> package com. waylau. rest; import org. codehaus. jackson. jaxrs. jacksonJsonProvider; import org. glassfish. jersey. filter. loggingFilter; import org. glassfish. jersey. server. resourceConfig;/*** application * @ author waylau.com * 2014-3-18 */public class RestApplication extends ResourceConfig {public RestApplication () {// package path of the service class package ("com. waylau. rest. resources "); // register the JSON converter register (JacksonJsonProvider. class );}}
6. modify web. xml and initialize the application from RestApplicaton, as shown below:

        
  
   Way REST Service
   
  
   org.glassfish.jersey.servlet.ServletContainer
    
         
   
    javax.ws.rs.Application
          
   
    com.waylau.rest.RestApplication
      
       
  
   1
    
     
     
  
   Way REST Service
      
  
   /rest/*
    
 

7. Run the project and access http: // localhost: 8089/RestDemo/rest/users/getUserJson again.
JSON text output