在该文档中,我将带领大家使用基于JAX-RS REST风格的实现Jersey来上传文件到服务器制定的文件夹,如果是图片并读取显示出该图片。
准备工作:
- 准备一个form表单,有两个字段,一个是type="file"和type="text",并且表单需要使用POST方式提交。注意改表单需要使用
multipart/form-data
。- 该项目使用netbeans8.0和glassfish4.0开发和运行。并且使用maven管理该工程;
- 需要在您的C盘建立一个文件夹,用来存储上传的文件。如C:\Newsportal\article_images
开发环境:
1 创建工程 在你项目空白处右键-》点击新建项目2 在创建的项目中选择maven-》点击右侧web应用程序
3 填写工程的名字和maven的组ID和包名
4 选择该项目的运行环境为服务器Glassfish server
5 最后点击完成
准备搭建jersey的运行环境:
1 配置maven需要依赖包,maven的pom文件依赖如下:
2 配置web.xml用以支持jersey,配置如下:
4.0.0 com.vi8 jerseyUploadDemo 1.0-SNAPSHOT war jerseyUploadDemo jersey上传文件DMEO ${project.build.directory}/endorsed UTF-8 org.glassfish.jersey.core jersey-server 2.0 jar provided org.glassfish.jersey.ext jersey-mvc-jsp 2.0 jar provided org.glassfish.jersey.media jersey-media-json-jackson 2.0 jar provided org.glassfish.jersey.media jersey-media-multipart 2.0 provided commons-io commons-io 2.4 javax javaee-web-api 7.0 provided org.apache.maven.plugins maven-compiler-plugin 3.1 1.7 ${endorsed.dir} org.apache.maven.plugins maven-war-plugin 2.3 false org.apache.maven.plugins maven-dependency-plugin 2.6 validate copy ${endorsed.dir} true javax javaee-endorsed-api 7.0 jar 3 编写上面web.xml用到的MyApplication.java 如下:
JerseyFilter org.glassfish.jersey.servlet.ServletContainer javax.ws.rs.Application com.vi8.upload.MyApplication jersey.config.servlet.filter.staticContentRegex /(img|css|js|font)/.* jersey.config.servlet.filter.forwardOn404 true jersey.config.server.mvc.templateBasePath.jsp /WEB-INF/pages JerseyFilter /* index.jsp 以上步骤基本就是jersey运行环境准备工作,接下开始讨论文件如何上传的。package com.vi8.upload; import javax.ws.rs.ApplicationPath; import org.glassfish.jersey.jackson.JacksonFeature; import org.glassfish.jersey.media.multipart.MultiPartFeature; import org.glassfish.jersey.server.ResourceConfig; import org.glassfish.jersey.server.mvc.jsp.JspMvcFeature; /** * qq: [email protected] * * @author Administrator */ @ApplicationPath("/") public class MyApplication extends ResourceConfig { public MyApplication() { packages("com.vi8.upload.resources"); register(JspMvcFeature.class); register(JacksonFeature.class); register(MultiPartFeature.class); } }
jersey文件上传:
1 文件上传的Resource类,你可以理解是spring mvc中控制器。UploadImageResource.java清单代码
package com.vi8.upload.resources; import java.io.File; import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; import java.io.UnsupportedEncodingException; import java.util.Calendar; import java.util.logging.Level; import java.util.logging.Logger; import javax.servlet.http.HttpServletResponse; import javax.ws.rs.Consumes; import javax.ws.rs.GET; import javax.ws.rs.POST; import javax.ws.rs.Path; import javax.ws.rs.PathParam; import javax.ws.rs.Produces; import javax.ws.rs.core.Context; import javax.ws.rs.core.MediaType; import org.apache.commons.io.FileUtils; import org.glassfish.jersey.media.multipart.ContentDisposition; import org.glassfish.jersey.media.multipart.FormDataBodyPart; import org.glassfish.jersey.media.multipart.FormDataContentDisposition; import org.glassfish.jersey.media.multipart.FormDataMultiPart; import org.glassfish.jersey.media.multipart.FormDataParam; /** * qq : 845885222 * * @author Administrator */ @Path("upload") public class UploadImageResource { /** * Constants operating with images */ private static final String ARTICLE_IMAGES_PATH = "c:/Newsportal/article_images/"; private static final String JPG_CONTENT_TYPE = "image/jpeg"; private static final String PNG_CONTENT_TYPE = "image/png"; /** * 第一种方式上传 * * @param fileInputStream * @param disposition * @return */ @POST @Path("uploadimage1 ") @Consumes(MediaType.MULTIPART_FORM_DATA) public String uploadimage1(@FormDataParam("file") InputStream fileInputStream, @FormDataParam("file") FormDataContentDisposition disposition) { String imageName = Calendar.getInstance().getTimeInMillis() + disposition.getFileName(); File file = new File(ARTICLE_IMAGES_PATH + imageName); try { //使用common io的文件写入操作 FileUtils.copyInputStreamToFile(fileInputStream, file); //原来自己的文件写入操作 //saveFile(fileInputStream, file); } catch (IOException ex) { Logger.getLogger(UploadImageResource.class.getName()).log(Level.SEVERE, null, ex); } return "images/" + imageName; } /** * * * 第二种方式上传 使用FormDataMultiPart 获取表单数据 * * @param form * @param response * @return * @throws UnsupportedEncodingException */ @POST @Path("uploadimage2") @Consumes(MediaType.MULTIPART_FORM_DATA) @Produces(MediaType.APPLICATION_JSON) public String uploadimage2(FormDataMultiPart form, @Context HttpServletResponse response) throws UnsupportedEncodingException { //获取文件流 FormDataBodyPart filePart = form.getField("file"); //获取表单的其他数据 FormDataBodyPart usernamePart = form.getField("username"); //ContentDisposition headerOfFilePart = filePart.getContentDisposition(); //把表单内容转换成流 InputStream fileInputStream = filePart.getValueAs(InputStream.class); FormDataContentDisposition formDataContentDisposition = filePart.getFormDataContentDisposition(); String source = formDataContentDisposition.getFileName(); String result = new String(source.getBytes("ISO8859-1"), "UTF-8"); System.out.println("formDataContentDisposition.getFileName()result " + result); String filePath = ARTICLE_IMAGES_PATH + result; File file = new File(filePath); System.out.println("file " + file.getAbsolutePath()); try { //保存文件 FileUtils.copyInputStreamToFile(fileInputStream, file); // saveFile(fileInputStream, file); } catch (IOException ex) { Logger.getLogger(UploadImageResource.class.getName()).log(Level.SEVERE, null, ex); } System.out.println("" + "images/" + result); response.setCharacterEncoding("UTF-8"); return "images/" + result; } /** * * 不从web服务器去读图片,在磁盘某个目录的文件可以通过流的方式去获取 ,通过 response.getOutputStream()放回数据 * * @param imageName image-name * @param type extension of image * @param response {@link HttpServletResponse} * @throws IOException */ @GET @Path("/images/{name}.{type}") public void showImg(@PathParam("name") String imageName, @PathParam("type") String type, @Context HttpServletResponse response) throws IOException { System.out.println("showImg"); try (InputStream in = new FileInputStream(ARTICLE_IMAGES_PATH + imageName + "." + type)) { FileUtils.copyFile(new File(ARTICLE_IMAGES_PATH + imageName + "." + type), response.getOutputStream()); // FileCopyUtils.copy(in, response.getOutputStream()); } } // 保存文件信息到磁盘 private void saveFile(InputStream uploadedInputStream, File file) { System.out.println("------saveFile-----"); try { OutputStream outpuStream = new FileOutputStream(file); int read = 0; byte[] bytes = new byte[1024]; // outpuStream = new FileOutputStream(new File(serverLocation)); while ((read = uploadedInputStream.read(bytes)) != -1) { outpuStream.write(bytes, 0, read); } outpuStream.flush(); outpuStream.close(); } catch (IOException e) { e.printStackTrace(); } } }
2 当然要测试你也许还需要准备一个带有form表单的jsp文件
3 测试输入http://localhost:8080/jerseyUploadDemo/
结果如下
最后贴上测试代码 在测试代码中会上面列出的有点出入.主要是显示使用Viewable 实现:
1 代码托管在此:
https://github.com/wangko27/jerseyUploadDemo
2 如果不用github你也可以来这儿下载 http://download.csdn.net/detail/wk313753744/8751943
3 当然如果下载链接失效,你还可以加入qq群: 438394076 讨论