基于Java中两种jersey文件上传方式_Java教程-查字典教程网

摘要：本文将带领大家使用基于JAX-RSREST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...

本文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:Newsportalarticle_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：

<"1.0" encoding="UTF-8"?>

<artifactId>jerseyUploadDemo</artifactId>

<version>1.0-SNAPSHOT</version>

<name>jerseyUploadDemo</name>

jersey上传文件DMEO

</description>

<endorsed.dir>${project.build.directory}/endorsed</endorsed.dir>

<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>

</properties>

<groupId>org.glassfish.jersey.core</groupId>

<artifactId>jersey-server</artifactId>

<scope>provided</scope>

</dependency>

<groupId>org.glassfish.jersey.ext</groupId>

<artifactId>jersey-mvc-jsp</artifactId>

<scope>provided</scope>

</dependency>

<groupId>org.glassfish.jersey.media</groupId>

<artifactId>jersey-media-json-jackson</artifactId>

<scope>provided</scope>

</dependency>

<groupId>org.glassfish.jersey.media</groupId>

<artifactId>jersey-media-multipart</artifactId>

<scope>provided</scope>

</dependency>

<groupId>commons-io</groupId>

<artifactId>commons-io</artifactId>

</dependency>

<groupId>javax</groupId>

<artifactId>javaee-web-api</artifactId>

<scope>provided</scope>

</dependency>

</dependencies>

<build>

<groupId>org.apache.maven.plugins</groupId>

<artifactId>maven-compiler-plugin</artifactId>

<endorseddirs>${endorsed.dir}</endorseddirs>

</compilerArguments>

</configuration>

</plugin>

<groupId>org.apache.maven.plugins</groupId>

<artifactId>maven-war-plugin</artifactId>

<failOnMissingWebXml>false</failOnMissingWebXml>

</configuration>

</plugin>

<groupId>org.apache.maven.plugins</groupId>

<artifactId>maven-dependency-plugin</artifactId>

<phase>validate</phase>

<goals>

</goals>

<outputDirectory>${endorsed.dir}</outputDirectory>

<groupId>javax</groupId>

<artifactId>javaee-endorsed-api</artifactId>

</artifactItem>

</artifactItems>

</configuration>

</execution>

</executions>

</plugin>

</plugins>

</build>

</project>

2 配置web.xml用以支持jersey，配置如下:

<"1.0" encoding="UTF-8"?>

<web-app version="3.1" xmlns="http://xmlns.jcp.org/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd">

<filter-name>JerseyFilter</filter-name>

<filter-class>org.glassfish.jersey.servlet.ServletContainer</filter-class>

<init-param>

<param-name>javax.ws.rs.Application</param-name>

<param-value>com.vi8.upload.MyApplication</param-value>

</init-param>

<init-param>

<param-name>jersey.config.servlet.filter.staticContentRegex</param-name>

<param-value>/(img|css|js|font)/.*</param-value>

</init-param>

<init-param>

<param-name>jersey.config.servlet.filter.forwardOn404</param-name>

<param-value>true</param-value>

</init-param>

<init-param>

<param-name>jersey.config.server.mvc.templateBasePath.jsp</param-name>

<param-value>/WEB-INF/pages</param-value>

</init-param>

</filter>

<filter-mapping>

<filter-name>JerseyFilter</filter-name>

<url-pattern>/*</url-pattern>

</filter-mapping>

<welcome-file-list>

<welcome-file>index.jsp</welcome-file>

</welcome-file-list>

</web-app>

3 编写上面web.xml用到的MyApplication.java 如下：

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: 845885222@qq.com

* @author Administrator

@ApplicationPath("/")

public class MyApplication extends ResourceConfig {

public MyApplication() {

packages("com.vi8.upload.resources");

}

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。

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;

@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

<p>

文件 :<input type="file" name="file"/><br />

用户名: <input type="text" name="username"/><br />

</p>

</form>

结果如下

以上就是本文的全部内容，希望对大家实现jersey文件上传有所帮助。