{"id":62043,"date":"2024-10-13T15:42:16","date_gmt":"2024-10-13T07:42:16","guid":{"rendered":"https:\/\/server.hk\/cnblog\/62043\/"},"modified":"2024-10-13T15:42:16","modified_gmt":"2024-10-13T07:42:16","slug":"java%e5%af%a6%e7%8f%be%e5%9c%96%e7%89%87%e4%b8%8a%e5%82%b3%e5%8f%8a%e6%95%b8%e6%93%9a%e5%ba%ab%e5%ad%98%e5%84%b2-java%e5%9c%96%e7%89%87%e6%95%b8%e6%93%9a%e5%ba%ab","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/62043\/","title":{"rendered":"Java\u5be6\u73fe\u5716\u7247\u4e0a\u50b3\u53ca\u6578\u64da\u5eab\u5b58\u5132 (java\u5716\u7247\u6578\u64da\u5eab)"},"content":{"rendered":"

Java\u5be6\u73fe\u5716\u7247\u4e0a\u50b3\u53ca\u6578\u64da\u5eab\u5b58\u5132 (java\u5716\u7247\u6578\u64da\u5eab)<\/h1>\n

\u5728\u7576\u4eca\u7684\u7db2\u7d61\u61c9\u7528\u4e2d\uff0c\u5716\u7247\u4e0a\u50b3\u529f\u80fd\u5df2\u6210\u70ba\u4e00\u500b\u57fa\u672c\u9700\u6c42\u3002\u7121\u8ad6\u662f\u793e\u4ea4\u5a92\u9ad4\u5e73\u53f0\u3001\u96fb\u5b50\u5546\u52d9\u7db2\u7ad9\u9084\u662f\u500b\u4eba\u535a\u5ba2\uff0c\u5716\u7247\u7684\u4e0a\u50b3\u548c\u5b58\u5132\u90fd\u662f\u4e0d\u53ef\u6216\u7f3a\u7684\u90e8\u5206\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u5982\u4f55\u4f7f\u7528Java\u5be6\u73fe\u5716\u7247\u4e0a\u50b3\u53ca\u5176\u5728\u6578\u64da\u5eab\u4e2d\u7684\u5b58\u5132\uff0c\u4e26\u63d0\u4f9b\u76f8\u95dc\u7684\u4ee3\u78bc\u793a\u4f8b\u3002<\/p>\n

\u5716\u7247\u4e0a\u50b3\u7684\u57fa\u672c\u6d41\u7a0b<\/h2>\n

\u5716\u7247\u4e0a\u50b3\u7684\u57fa\u672c\u6d41\u7a0b\u53ef\u4ee5\u5206\u70ba\u4ee5\u4e0b\u5e7e\u500b\u6b65\u9a5f\uff1a<\/p>\n

    \n
  1. \u7528\u6236\u5728\u524d\u7aef\u9078\u64c7\u5716\u7247\u6587\u4ef6\u3002<\/li>\n
  2. \u524d\u7aef\u5c07\u5716\u7247\u6587\u4ef6\u767c\u9001\u5230\u5f8c\u7aef\u670d\u52d9\u5668\u3002<\/li>\n
  3. \u5f8c\u7aef\u63a5\u6536\u5716\u7247\u4e26\u9032\u884c\u8655\u7406\u3002<\/li>\n
  4. \u5c07\u5716\u7247\u6578\u64da\u5b58\u5132\u5230\u6578\u64da\u5eab\u4e2d\u3002<\/li>\n<\/ol>\n

    \u524d\u7aef\u5be6\u73fe<\/h2>\n

    \u5728\u524d\u7aef\uff0c\u6211\u5011\u53ef\u4ee5\u4f7f\u7528HTML\u8868\u55ae\u4f86\u5be6\u73fe\u5716\u7247\u7684\u4e0a\u50b3\u529f\u80fd\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u7c21\u55ae\u7684HTML\u8868\u55ae\u793a\u4f8b\uff1a<\/p>\n

    <form action=\"upload\" method=\"post\" enctype=\"multipart\/form-data\">\n    <input type=\"file\" name=\"image\" accept=\"image\/*\">\n    <input type=\"submit\" value=\"\u4e0a\u50b3\u5716\u7247\">\n<\/form><\/code><\/pre>\n
    \u5f8c\u7aef\u5be6\u73fe<\/h2>\n
    \u5728\u5f8c\u7aef\uff0c\u6211\u5011\u53ef\u4ee5\u4f7f\u7528Java Servlet\u4f86\u8655\u7406\u5716\u7247\u7684\u4e0a\u50b3\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u7c21\u55ae\u7684Servlet\u793a\u4f8b\uff1a<\/p>\n
    import java.io.*;\nimport javax.servlet.*;\nimport javax.servlet.http.*;\nimport java.sql.*;\n\npublic class ImageUploadServlet extends HttpServlet {\n    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {\n        Part filePart = request.getPart(\"image\"); \/\/ \u7372\u53d6\u4e0a\u50b3\u7684\u6587\u4ef6\n        InputStream fileContent = filePart.getInputStream();\n\n        \/\/ \u6578\u64da\u5eab\u9023\u63a5\n        String jdbcURL = \"jdbc:mysql:\/\/localhost:3306\/your_database\";\n        String dbUser = \"your_username\";\n        String dbPass = \"your_password\";\n\n        try (Connection conn = DriverManager.getConnection(jdbcURL, dbUser, dbPass)) {\n            String sql = \"INSERT INTO images (image_data) VALUES (?)\";\n            PreparedStatement statement = conn.prepareStatement(sql);\n            statement.setBlob(1, fileContent);\n            statement.executeUpdate();\n        } catch (SQLException e) {\n            e.printStackTrace();\n        }\n    }\n}<\/code><\/pre>\n
    \u6578\u64da\u5eab\u8a2d\u8a08<\/h2>\n
    \u5728\u6578\u64da\u5eab\u4e2d\uff0c\u6211\u5011\u9700\u8981\u4e00\u500b\u8868\u4f86\u5b58\u5132\u5716\u7247\u6578\u64da\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u7c21\u55ae\u7684MySQL\u8868\u7d50\u69cb\u793a\u4f8b\uff1a<\/p>\n
    CREATE TABLE images (\n    id INT AUTO_INCREMENT PRIMARY KEY,\n    image_data LONGBLOB NOT NULL\n);<\/code><\/pre>\n
    \u5716\u7247\u7684\u6aa2\u7d22<\/h2>\n
    \u9664\u4e86\u4e0a\u50b3\u5716\u7247\uff0c\u6211\u5011\u9084\u9700\u8981\u80fd\u5920\u5f9e\u6578\u64da\u5eab\u4e2d\u6aa2\u7d22\u5716\u7247\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u7c21\u55ae\u7684\u6aa2\u7d22\u793a\u4f8b\uff1a<\/p>\n
    public void retrieveImage(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {\n    int imageId = Integer.parseInt(request.getParameter(\"id\"));\n\n    String jdbcURL = \"jdbc:mysql:\/\/localhost:3306\/your_database\";\n    String dbUser = \"your_username\";\n    String dbPass = \"your_password\";\n\n    try (Connection conn = DriverManager.getConnection(jdbcURL, dbUser, dbPass)) {\n        String sql = \"SELECT image_data FROM images WHERE id = ?\";\n        PreparedStatement statement = conn.prepareStatement(sql);\n        statement.setInt(1, imageId);\n        ResultSet resultSet = statement.executeQuery();\n\n        if (resultSet.next()) {\n            Blob blob = resultSet.getBlob(\"image_data\");\n            InputStream inputStream = blob.getBinaryStream();\n            response.setContentType(\"image\/jpeg\");\n            OutputStream outputStream = response.getOutputStream();\n            byte[] buffer = new byte[1024];\n            int bytesRead;\n            while ((bytesRead = inputStream.read(buffer)) != -1) {\n                outputStream.write(buffer, 0, bytesRead);\n            }\n        }\n    } catch (SQLException e) {\n        e.printStackTrace();\n    }\n}<\/code><\/pre>\n
    \u7e3d\u7d50<\/h2>\n
    \u901a\u904e\u4ee5\u4e0a\u7684\u4ecb\u7d39\uff0c\u6211\u5011\u53ef\u4ee5\u770b\u5230\u5982\u4f55\u4f7f\u7528Java\u5be6\u73fe\u5716\u7247\u7684\u4e0a\u50b3\u53ca\u5176\u5728\u6578\u64da\u5eab\u4e2d\u7684\u5b58\u5132\u3002\u9019\u4e00\u904e\u7a0b\u6d89\u53ca\u5230\u524d\u7aef\u7684\u8868\u55ae\u8a2d\u8a08\u3001\u5f8c\u7aef\u7684Servlet\u8655\u7406\u4ee5\u53ca\u6578\u64da\u5eab\u7684\u8a2d\u8a08\u8207\u64cd\u4f5c\u3002\u96a8\u8457\u6280\u8853\u7684\u767c\u5c55\uff0c\u9019\u4e9b\u529f\u80fd\u5728\u5404\u985e\u61c9\u7528\u4e2d\u8b8a\u5f97\u8d8a\u4f86\u8d8a\u91cd\u8981\u3002<\/p>\n
    \u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u7a69\u5b9a\u7684 VPS<\/a> \u89e3\u6c7a\u65b9\u6848\u4f86\u90e8\u7f72\u60a8\u7684\u61c9\u7528\uff0cServer.HK \u63d0\u4f9b\u591a\u7a2e\u9078\u64c7\uff0c\u6eff\u8db3\u4e0d\u540c\u9700\u6c42\u3002\u7121\u8ad6\u662f \u9999\u6e2fVPS<\/a> \u9084\u662f\u5176\u4ed6\u985e\u578b\u7684 \u4f3a\u670d\u5668<\/a>\uff0c\u6211\u5011\u90fd\u80fd\u70ba\u60a8\u63d0\u4f9b\u652f\u6301\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
    \u5b78\u7fd2\u5982\u4f55\u4f7f\u7528Java\u5be6\u73fe\u5716\u7247\u4e0a\u50b3\u53ca\u6578\u64da\u5eab\u5b58\u5132\uff0c\u7c21\u5316\u5716\u7247\u7ba1\u7406\uff0c\u63d0\u5347\u61c9\u7528\u6027\u80fd\u8207\u7528\u6236\u9ad4\u9a57\u3002<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-62043","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/62043","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=62043"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/62043\/revisions"}],"predecessor-version":[{"id":62044,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/62043\/revisions\/62044"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=62043"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=62043"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=62043"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}