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RESTEasy文件上传，使用html form表格

2014-02-26 10:00 351 查看

我们使用下面的UI来向服务器上传文件：

1) 创建maven工程，用于文件上传

略

2) 更新项目的依赖 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.howtodoinjava</groupId>
<artifactId>RESTfulDemoApplication</artifactId>
<packaging>war</packaging>
<version>1.0-SNAPSHOT</version>
<name>RESTfulDemoApplication Maven Webapp</name>
<url>http://maven.apache.org</url>
<repositories>
<repository>
<id>jboss</id>
<url>http://repository.jboss.org/maven2</url>
</repository>
</repositories>
<dependencies>
<!-- Junit support -->
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>3.8.1</version>
<scope>test</scope>
</dependency>
<!-- core library -->
<dependency>
<groupId>org.jboss.resteasy</groupId>
<artifactId>resteasy-jaxrs</artifactId>
<version>2.3.1.GA</version>
</dependency>
<dependency>
<groupId>net.sf.scannotation</groupId>
<artifactId>scannotation</artifactId>
<version>1.0.2</version>
</dependency>
<!-- JAXB provider -->
<dependency>
<groupId>org.jboss.resteasy</groupId>
<artifactId>resteasy-jaxb-provider</artifactId>
<version>2.3.1.GA</version>
</dependency>
<!-- Multipart support -->
<dependency>
<groupId>org.jboss.resteasy</groupId>
<artifactId>resteasy-multipart-provider</artifactId>
<version>2.3.1.GA</version>
</dependency>
<!-- For better I/O control -->
<dependency>
<groupId>commons-io</groupId>
<artifactId>commons-io</artifactId>
<version>2.0.1</version>
</dependency>
</dependencies>
<build>
<finalName>RESTfulDemoApplication</finalName>
</build>
</project>

3) 更新web.xml文件来部署REST
APIs

<!DOCTYPE web-app PUBLIC
"-//Sun Microsystems, Inc.//DTD Web Application 2.3//EN"
"http://java.sun.com/dtd/web-app_2_3.dtd" >

<web-app>
<display-name>Archetype Created Web Application</display-name>

<!-- Auto scan REST service -->
<context-param>
<param-name>resteasy.scan</param-name>
<param-value>true</param-value>
</context-param>

<listener>
<listener-class>
org.jboss.resteasy.plugins.server.servlet.ResteasyBootstrap
</listener-class>
</listener>

<servlet>
<servlet-name>resteasy-servlet</servlet-name>
<servlet-class>
org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher
</servlet-class>
</servlet>

<servlet-mapping>
<servlet-name>resteasy-servlet</servlet-name>
<url-pattern>/rest-ws/*</url-pattern>
</servlet-mapping>

</web-app>

4)
添加 index.jsp 文件来设计上传UI

<html>
<body>
<h1>JAX-RS File Upload Example</h1>
<form action="rest-ws/upload-file" method="post" enctype="multipart/form-data">
<p>
File name : <input type="text" name="fileName" />
</p>
<p>
Choose the file : <input type="file" name="selectedFile" />
</p>
<input type="submit" value="Upload" />
</form>
 http://www.howtodoinjava.com 
</body>
</html>

5) 创建FileUploadForm类，来记录从HTML
form中长传上来的数据信息：

package com.howtodoinjava.client.upload;

import javax.ws.rs.FormParam;
import org.jboss.resteasy.annotations.providers.multipart.PartType;

public class FileUploadForm {

public FileUploadForm() {
}

private byte[] fileData;
private String fileName;

public String getFileName() {
return fileName;
}

@FormParam("fileName")
public void setFileName(String fileName) {
this.fileName = fileName;
}

public byte[] getFileData() {
return fileData;
}

@FormParam("selectedFile")
@PartType("application/octet-stream")
public void setFileData(byte[] fileData) {
this.fileData = fileData;
}
}

6) 创建RESTful API来处理文件上传回调：

package com.howtodoinjava.client.upload;
 
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
 
import javax.ws.rs.Consumes;
import javax.ws.rs.POST;
import javax.ws.rs.Path;
import javax.ws.rs.core.Response;
 
import org.jboss.resteasy.annotations.providers.multipart.MultipartForm;
 
@Path("/rest-ws")
public class DemoFileSaver_MultipartForm
{
    @POST
    @Path("/upload-file")
    @Consumes("multipart/form-data")
    public Response uploadFile(@MultipartForm FileUploadForm form) {
  
        String fileName = form.getFileName() == null ? "Unknown" : form.getFileName() ;
         
        String completeFilePath = "c:/temp/" + fileName;
        try
        {
            //Save the file
            File file = new File(completeFilePath);
              
            if (!file.exists())
            {
                file.createNewFile();
            }
      
            FileOutputStream fos = new FileOutputStream(file);
      
            fos.write(form.getFileData());
            fos.flush();
            fos.close();
        }
        catch (IOException e)
        {
            e.printStackTrace();
        }
        //Build a response to return
        return Response.status(200)
            .entity("uploadFile is called, Uploaded file name : " + fileName).build();
    }
}

Happy Learning !!

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标签： RestEasy

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