RESTEasy使用httpclient上传文件

我们使用resteasy-multipart的MultipartFormDataInput类来操作数据。

1) 更新maven项目依赖

添加下面的maven依赖到你的项目：

<!-- 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>

同样也添加以下图片中的jar包，到你的项目依赖中：

2) 准备http client，用于客户端上传文件：

package com.howtodoinjava.client.upload;  import java.io.File; import org.apache.http.HttpResponse;import org.apache.http.client.HttpClient;import org.apache.http.client.methods.HttpPost;import org.apache.http.entity.mime.MultipartEntity;import org.apache.http.entity.mime.content.FileBody;import org.apache.http.entity.mime.content.StringBody;import org.apache.http.impl.client.DefaultHttpClient;  public class DemoFileUploader {    public static void main(String args[]) throws Exception    {        DemoFileUploader fileUpload = new DemoFileUploader () ;        File file = new File("C:/Lokesh/Setup/workspace/RESTfulDemoApplication/target/classes/Tulips.jpg") ;        //Upload the file        fileUpload.executeMultiPartRequest("http://localhost:8080/RESTfulDemoApplication/user-management/image-upload",                 file, file.getName(), "File Uploaded :: Tulips.jpg") ;    }           public void executeMultiPartRequest(String urlString, File file, String fileName, String fileDescription) throws Exception     {        HttpClient client = new DefaultHttpClient() ;        HttpPost postRequest = new HttpPost (urlString) ;        try        {            //Set various attributes             MultipartEntity multiPartEntity = new MultipartEntity () ;            multiPartEntity.addPart("fileDescription", new StringBody(fileDescription != null ? fileDescription : "")) ;            multiPartEntity.addPart("fileName", new StringBody(fileName != null ? fileName : file.getName())) ;              FileBody fileBody = new FileBody(file, "application/octect-stream") ;            //Prepare payload            multiPartEntity.addPart("attachment", fileBody) ;              //Set to request body            postRequest.setEntity(multiPartEntity) ;                         //Send request            HttpResponse response = client.execute(postRequest) ;                         //Verify response if any            if (response != null)            {                System.out.println(response.getStatusLine().getStatusCode());            }        }        catch (Exception ex)        {            ex.printStackTrace() ;        }    }}

3)编写RESTful API应用来处理文件请求：

package com.howtodoinjava.client.upload; import java.io.File;import java.io.FileOutputStream;import java.io.IOException;import java.io.InputStream;import java.util.List;import java.util.Map; import javax.ws.rs.Consumes;import javax.ws.rs.POST;import javax.ws.rs.Path;import javax.ws.rs.core.MultivaluedMap;import javax.ws.rs.core.Response; import org.apache.commons.io.IOUtils;import org.jboss.resteasy.plugins.providers.multipart.InputPart;import org.jboss.resteasy.plugins.providers.multipart.MultipartFormDataInput; @Path("/user-management")public class DemoFileSaver_MultipartFormDataInput {    private final String UPLOADED_FILE_PATH = "c:\temp\";     @POST    @Path("/image-upload")    @Consumes("multipart/form-data")    public Response uploadFile(MultipartFormDataInput input) throws IOException     {        //Get API input data        Map<String, List<InputPart>> uploadForm = input.getFormDataMap();                 //Get file name        String fileName = uploadForm.get("fileName").get(0).getBodyAsString();                 //Get file data to save        List<InputPart> inputParts = uploadForm.get("attachment");         for (InputPart inputPart : inputParts)        {            try            {                //Use this header for extra processing if required                @SuppressWarnings("unused")                MultivaluedMap<String, String> header = inputPart.getHeaders();                                 // convert the uploaded file to inputstream                InputStream inputStream = inputPart.getBody(InputStream.class, null);                                 byte[] bytes = IOUtils.toByteArray(inputStream);                // constructs upload file path                fileName = UPLOADED_FILE_PATH + fileName;                writeFile(bytes, fileName);                System.out.println("Success !!!!!");            }             catch (Exception e)             {                e.printStackTrace();            }        }        return Response.status(200)                .entity("Uploaded file name : "+ fileName).build();    }     //Utility method    private void writeFile(byte[] content, String filename) throws IOException     {        File file = new File(filename);        if (!file.exists()) {            file.createNewFile();        }        FileOutputStream fop = new FileOutputStream(file);        fop.write(content);        fop.flush();        fop.close();    }}

Happy Learning !!