archieve: homework6 change: java version

homework6/.idea/MarsCodeWorkspaceAppSettings.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="com.codeverse.userSettings.MarscodeWorkspaceAppSettingsState">
+    <option name="ckgOperationStatus" value="SUCCESS" />
+  </component>
+</project>

homework6/.idea/encodings.xml

@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="Encoding">
+    <file url="file://$PROJECT_DIR$/src/main/java" charset="UTF-8" />
+    <file url="file://$PROJECT_DIR$/src/main/resources" charset="UTF-8" />
+  </component>
+</project>

homework6/.idea/misc.xml

@@ -1,4 +1,14 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project version="4">
   <component name="ExternalStorageConfigurationManager" enabled="true" />
+  <component name="MavenProjectsManager">
+    <option name="originalFiles">
+      <list>
+        <option value="$PROJECT_DIR$/pom.xml" />
+      </list>
+    </option>
+  </component>
+  <component name="ProjectRootManager" version="2" languageLevel="JDK_1_8" default="true" project-jdk-name="1.8" project-jdk-type="JavaSDK">
+    <output url="file://$PROJECT_DIR$/out" />
+  </component>
 </project>

homework6/.idea/vcs.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project version="4">
+  <component name="VcsDirectoryMappings">
+    <mapping directory="$PROJECT_DIR$/.." vcs="Git" />
+  </component>
+</project>

homework6/pom.xml

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<project xmlns="http://maven.apache.org/POM/4.0.0"
+<project xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xmlns="http://maven.apache.org/POM/4.0.0"
          xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
     <modelVersion>4.0.0</modelVersion>
 
@@ -18,6 +18,31 @@
     </properties>
 
     <dependencies>
+        <!-- https://mvnrepository.com/artifact/commons-fileupload/commons-fileupload -->
+        <dependency>
+            <groupId>commons-fileupload</groupId>
+            <artifactId>commons-fileupload</artifactId>
+            <version>1.3.3</version>
+        </dependency>
+        <!-- https://mvnrepository.com/artifact/commons-io/commons-io -->
+        <dependency>
+            <groupId>commons-io</groupId>
+            <artifactId>commons-io</artifactId>
+            <version>2.7</version>
+        </dependency>
+        <!-- https://mvnrepository.com/artifact/javax.servlet.jsp.jstl/javax.servlet.jsp.jstl-api -->
+        <dependency>
+            <groupId>javax.servlet.jsp.jstl</groupId>
+            <artifactId>javax.servlet.jsp.jstl-api</artifactId>
+            <version>1.2.2</version>
+        </dependency>
+        <!-- https://mvnrepository.com/artifact/org.apache.taglibs/taglibs-standard-impl -->
+        <dependency>
+            <groupId>org.apache.taglibs</groupId>
+            <artifactId>taglibs-standard-impl</artifactId>
+            <version>1.2.5</version>
+            <scope>runtime</scope>
+        </dependency>
         <dependency>
             <groupId>javax.servlet</groupId>
             <artifactId>javax.servlet-api</artifactId>
@@ -35,7 +60,8 @@
             <artifactId>junit-jupiter-engine</artifactId>
             <version>${junit.version}</version>
             <scope>test</scope>
-    </dependency>  </dependencies>
+        </dependency>
+    </dependencies>
 
     <build>
         <plugins>
@@ -43,6 +69,7 @@
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-war-plugin</artifactId>
                 <version>3.3.2</version>
-      </plugin>    </plugins>
+            </plugin>
+        </plugins>
     </build>
 </project>

homework6/src/main/java/com/msksbr/homework6/fileupload/DownloadServlet.java

@@ -0,0 +1,45 @@
+package com.msksbr.homework6.fileupload;
+
+import javax.servlet.ServletException;
+import javax.servlet.annotation.WebServlet;
+import javax.servlet.http.HttpServlet;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+
+@WebServlet(name = "DownloadServlet", urlPatterns = "/DownloadServlet")
+public class DownloadServlet extends HttpServlet {
+    private static final long serialVersionUID = 1L;
+
+    public void doGet(HttpServletRequest request, HttpServletResponse
+            response) throws ServletException, IOException {
+        //设置ContentType字段值
+        response.setContentType("text/html;charset=utf-8");
+        //获取所要下载的文件名称
+        String filename = request.getParameter("filename");
+        //下载文件所在目录
+        String folder = "/upload/";
+        // 通知浏览器以下载的方式打开
+        response.addHeader("Content-Type", "application/octet-stream");
+        response.addHeader("Content-Disposition",
+                "attachment;filename=" + filename);
+        folder = folder + filename;
+        // 通过文件流读取文件
+        InputStream in = getServletContext().getResourceAsStream(folder);
+        // 获取response对象的输出流
+        OutputStream out = response.getOutputStream();
+        byte[] buffer = new byte[1024];
+        int len;
+        //循环取出流中的数据
+        while ((len = in.read(buffer)) != -1) {
+            out.write(buffer, 0, len);
+        }
+    }
+
+    public void doPost(HttpServletRequest request, HttpServletResponse
+            response) throws ServletException, IOException {
+        doGet(request, response);
+    }
+}

homework6/src/main/java/com/msksbr/homework6/fileupload/UploadServlet.java

@@ -0,0 +1,104 @@
+package com.msksbr.homework6.fileupload;
+
+import org.apache.commons.fileupload.FileItem;
+import org.apache.commons.fileupload.disk.DiskFileItemFactory;
+import org.apache.commons.fileupload.servlet.ServletFileUpload;
+
+import javax.servlet.ServletException;
+import javax.servlet.annotation.MultipartConfig;
+import javax.servlet.annotation.WebServlet;
+import javax.servlet.http.HttpServlet;
+import javax.servlet.http.HttpServletRequest;
+import javax.servlet.http.HttpServletResponse;
+import java.io.*;
+import java.util.List;
+import java.util.UUID;
+
+@WebServlet(name = "UploadServlet", value = "/UploadServlet")
+@MultipartConfig
+public class UploadServlet extends HttpServlet {
+    private static final long serialVersionUID = 1L;
+
+    public void doGet(HttpServletRequest request,
+                      HttpServletResponse response) throws ServletException, IOException {
+        try {
+            //设置ContentType字段值
+            response.setContentType("text/html;charset=utf-8");
+            // 创建DiskFileItemFactory工厂对象
+            DiskFileItemFactory factory = new DiskFileItemFactory();
+            //设置文件缓存目录，如果该目录不存在则新创建一个
+            File f = new File("uploadTemp");
+            if (!f.exists()) {
+                f.mkdirs();
+            }
+            // 设置文件的缓存路径
+            factory.setRepository(f);
+            // 创建 ServletFileUpload对象
+            ServletFileUpload fileupload = new ServletFileUpload(factory);
+            //设置字符编码
+            fileupload.setHeaderEncoding("utf-8");
+            // 解析 request，得到上传文件的FileItem对象
+            List<FileItem> fileitems = fileupload.parseRequest(request);
+            //获取字符流
+            PrintWriter writer = response.getWriter();
+            // 遍历集合
+            for (FileItem fileitem : fileitems) {
+                // 判断是否为普通字段
+                if (fileitem.isFormField()) {
+                    // 获得字段名和字段值
+                    String name = fileitem.getFieldName();
+                    if (name.equals("name")) {
+                        //如果文件不为空，将其保存在value中
+                        if (!fileitem.getString().equals("")) {
+                            String value = fileitem.getString("utf-8");
+                            writer.print("上传者：" + value + "<br />");
+                        }
+                    }
+                } else {
+                    // 获取上传的文件名
+                    String filename = fileitem.getName();
+                    //处理上传文件
+                    if (filename != null && !filename.equals("")) {
+                        writer.print("上传的文件名称是：" + filename + "<br />");
+                        // 截取出文件名
+                        filename = filename.substring(filename.lastIndexOf("\\") + 1);
+                        // 文件名需要唯一
+                        filename = UUID.randomUUID() + "_" + filename;
+                        // 在服务器创建同名文件
+                        String webPath = "/upload/";
+                        //将服务器中文件夹路径与文件名组合成完整的服务器端路径
+                        String filepath = getServletContext()
+                                .getRealPath(webPath + filename);
+                        // 创建文件
+                        File file = new File(filepath);
+                        file.getParentFile().mkdirs();
+                        file.createNewFile();
+                        // 获得上传文件流
+                        InputStream in = fileitem.getInputStream();
+                        // 使用FileOutputStream打开服务器端的上传文件
+                        FileOutputStream out = new FileOutputStream(file);
+                        // 流的拷贝
+                        byte[] buffer = new byte[1024];//每次读取1个字节
+                        int len;
+                        //开始读取上传文件的字节，并将其输出到服务端的上传文件输出流中
+                        while ((len = in.read(buffer)) > 0)
+                            out.write(buffer, 0, len);
+                        // 关闭流
+                        in.close();
+                        out.close();
+                        // 删除临时文件
+                        fileitem.delete();
+                        writer.print("上传文件成功！<br />");
+                    }
+                }
+            }
+        } catch (Exception e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+    public void doPost(HttpServletRequest request,
+                       HttpServletResponse response) throws ServletException, IOException {
+        doGet(request, response);
+    }
+}

homework6/src/main/webapp/download.jsp

@@ -0,0 +1,11 @@
+<%@ page contentType="text/html;charset=UTF-8" language="java" %>
+<html>
+<head>
+    <title>文件下载</title>
+</head>
+<body>
+<a href=
+           "${pageContext.request.contextPath}/DownloadServlet?filename=avatar.png">
+    文件下载</a>
+</body>
+</html>

homework6/src/main/webapp/form.jsp

@@ -0,0 +1,22 @@
+<%@ page contentType="text/html;charset=UTF-8" language="java" %>
+<html>
+<head>
+    <title>Title</title>
+</head>
+<body>
+<form action="${pageContext.request.contextPath}/UploadServlet" method="post" enctype="multipart/form-data">
+    <table width="600px">
+        <tr>
+            <td>上传者</td>
+            <td><input type="text" name="name"></td>
+        <tr>
+            <td>上传文件</td>
+            <td><input type="file" name="myfile"></td>
+        </tr>
+        <tr>
+            <td colspan="2"><input type="submit" value="提交"></td>
+        </tr>
+    </table>
+</form>
+</body>
+</html>