{"id":19,"date":"2021-04-18T21:24:00","date_gmt":"2021-04-18T13:24:00","guid":{"rendered":"https:\/\/www.52dixiaowo.com\/jsp\/?p=19"},"modified":"2021-04-18T21:25:52","modified_gmt":"2021-04-18T13:25:52","slug":"servlet%e6%96%87%e4%bb%b6%e4%b8%8b%e8%bd%bd","status":"publish","type":"post","link":"https:\/\/www.52dixiaowo.com\/jsp\/post-19.html","title":{"rendered":"servlet\u6587\u4ef6\u4e0b\u8f7d"},"content":{"rendered":"\n<p>servlet\u6587\u4ef6\u5b9e\u73b0\u6587\u4ef6\u4e0b\u8f7d, \u4e0d\u9700\u8981\u989d\u5916\u7684jar\u5305, \u6211\u4eec\u9700\u8981\u7406\u89e3\u7684\u662f<\/p>\n\n\n\n<ul><li>\u5bf9\u4e8e\u6d4f\u89c8\u5668\u80fd\u89e3\u6790\u7684\u6587\u4ef6, \u9ed8\u8ba4\u4f1a\u88ab\u76f4\u63a5\u89e3\u6790<\/li><li>\u5bf9\u4e8e\u6d4f\u89c8\u5668\u4e0d\u80fd\u89e3\u6790\u7684\u6587\u4ef6, \u9ed8\u8ba4\u4f1a\u88ab\u4e0b\u8f7d<\/li><\/ul>\n\n\n\n<h2>\u524d\u7aef\u4ee3\u7801<\/h2>\n\n\n\n<p>\u6211\u4eec\u5728\u524d\u7aef, \u9ed8\u8ba4\u662f\u4e0d\u77e5\u9053\u6587\u4ef6\u7684\u771f\u5b9e\u8def\u5f84\u7684, \u6216\u8005\u8d44\u6e90\u88abfilter\u62e6\u622a\u65e0\u6cd5\u8bbf\u95ee, \u5426\u5219\u6839\u672c\u4e0d\u9700\u8981\u540e\u7aef, \u76f4\u63a5\u8bbf\u95ee\u5730\u5740\u5c31\u53ef\u4ee5\u4e86<\/p>\n\n\n\n<p>\u5047\u8bbe\u524d\u7aef\u901a\u8fc7 downloadServlet?filename=xxx \u8fd9\u6837\u7684\u5f62\u5f0f\u4e0b\u8f7d\u8d44\u6e90<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>&lt;!DOCTYPE html>\n&lt;html lang=\"en\">\n&lt;head>\n    &lt;meta charset=\"UTF-8\">\n    &lt;title>Servelt\u6587\u4ef6\u4e0b\u8f7d&lt;\/title>\n&lt;\/head>\n&lt;body>\n       \/\/\u5047\u5982\u5df2\u77e5\u6587\u4ef6\u7684\u771f\u5b9eurl,\u4e14\u672a\u88abfilter\n    &lt;a href=\"\/img\/1.jpg\">\u56fe\u72471&lt;\/a>\n    &lt;a href=\"\/img\/1.avi\">\u89c6\u9891&lt;\/a>\n    &lt;hr>\n    &lt;a href=\"\/xxx\/downloadServlet?filename=1.jpg\">\u56fe\u72471&lt;\/a>\n    &lt;a href=\"\/xxx\/downloadServlet?filename=1.avi\">\u89c6\u9891&lt;\/a>\n&lt;\/body>\n&lt;\/html><\/code><\/pre>\n\n\n\n<h2>\u540e\u7aef\u4ee3\u7801<\/h2>\n\n\n\n<p>\u5bf9\u4e8e\u4e0d\u540c\u7684\u6d4f\u89c8\u5668, \u53ef\u80fd\u4f1a\u6709\u6587\u4ef6\u540d\u4e71\u7801, \u8fd9\u91cc\u7528\u4e00\u4e2autil\u5de5\u5177\u5305\u89e3\u51b3\u4e71\u7801\u95ee\u9898, \u8fd9\u4e2a\u5de5\u5177\u5305\u4e00\u822c\u662f\u901a\u7528\u7684, \u539f\u7406\u662f\u901a\u8fc7user-agent\u5224\u65ad\u6d4f\u89c8\u5668\u7c7b\u578b, \u5e76\u5bf9\u6587\u4ef6\u540d\u505a\u51fa\u4e0d\u540c\u7684\u7f16\u7801\u65b9\u5f0f<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>import sun.misc.BASE64Encoder;\nimport java.io.UnsupportedEncodingException;\nimport java.net.URLEncoder;\n\n\npublic class DownLoadUtils {\n\n    public static String getFileName(String agent, String filename) throws UnsupportedEncodingException {\n        if (agent.contains(\"MSIE\")) {\n            \/\/ IE\u6d4f\u89c8\u5668\n            filename = URLEncoder.encode(filename, \"utf-8\");\n            filename = filename.replace(\"+\", \" \");\n        } else if (agent.contains(\"Firefox\")) {\n            \/\/ \u706b\u72d0\u6d4f\u89c8\u5668\n            BASE64Encoder base64Encoder = new BASE64Encoder();\n            filename = \"=?utf-8?B?\" + base64Encoder.encode(filename.getBytes(\"utf-8\")) + \"?=\";\n        } else {\n            \/\/ \u5176\u5b83\u6d4f\u89c8\u5668\n            filename = URLEncoder.encode(filename, \"utf-8\");\n        }\n        return filename;\n    }\n}\n<\/code><\/pre>\n\n\n\n<p>\u8fd9\u91cc, \u5047\u8bbe\u662f\u6839\u636e\u6587\u4ef6\u540d\u83b7\u53d6\u6587\u4ef6, \u6211\u4eec\u4f7f\u7528\u8f93\u5165\u6d41\u8bfb\u53d6\u6587\u4ef6, \u5e76\u628a\u5b83\u9001\u5230response.writer\u8f93\u51fa\u6d41\u4e2d\u5373\u53ef, \u6ce8\u610f\u8bbe\u7f6e\u54cd\u5e94\u5934.<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>import xxxxx.DownLoadUtils;  \/\/\u5f15\u5165\u4e0a\u9762\u7684utils\n\nimport javax.servlet.ServletContext;\nimport javax.servlet.ServletException;\nimport javax.servlet.ServletOutputStream;\nimport javax.servlet.annotation.WebServlet;\nimport javax.servlet.http.HttpServlet;\nimport javax.servlet.http.HttpServletRequest;\nimport javax.servlet.http.HttpServletResponse;\nimport java.io.FileInputStream;\nimport java.io.IOException;\n\n@WebServlet(\"\/downloadServlet\")\npublic class DownloadServlet extends HttpServlet {\n    protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {\n        \/\/1.\u83b7\u53d6\u8bf7\u6c42\u53c2\u6570\uff0c\u6587\u4ef6\u540d\u79f0\n        String filename = request.getParameter(\"filename\");\n        \/\/2.\u4f7f\u7528\u5b57\u8282\u8f93\u5165\u6d41\u52a0\u8f7d\u6587\u4ef6\u8fdb\u5185\u5b58\n        \/\/2.1\u627e\u5230\u6587\u4ef6\u670d\u52a1\u5668\u8def\u5f84\n        ServletContext servletContext = this.getServletContext();\n        String realPath = servletContext.getRealPath(\"\/img\/\" + filename);\n        \/\/2.2\u7528\u5b57\u8282\u6d41\u5173\u8054\n        FileInputStream fis = new FileInputStream(realPath);\n\n        \/\/3.\u8bbe\u7f6eresponse\u7684\u54cd\u5e94\u5934\n        \/\/3.1\u8bbe\u7f6e\u54cd\u5e94\u5934\u7c7b\u578b\uff1acontent-type\n        String mimeType = servletContext.getMimeType(filename);\/\/\u83b7\u53d6\u6587\u4ef6\u7684mime\u7c7b\u578b\n        response.setHeader(\"content-type\",mimeType);\n        \/\/3.2\u8bbe\u7f6e\u54cd\u5e94\u5934\u6253\u5f00\u65b9\u5f0f:content-disposition\n\n        \/\/\u89e3\u51b3\u4e2d\u6587\u6587\u4ef6\u540d\u95ee\u9898\n        \/\/1.\u83b7\u53d6user-agent\u8bf7\u6c42\u5934\u3001\n        String agent = request.getHeader(\"user-agent\");\n        \/\/2.\u4f7f\u7528\u5de5\u5177\u7c7b\u65b9\u6cd5\u7f16\u7801\u6587\u4ef6\u540d\u5373\u53ef\n        filename = DownLoadUtils.getFileName(agent, filename);\n\n        response.setHeader(\"content-disposition\",\"attachment;filename=\"+filename);\n        \/\/4.\u5c06\u8f93\u5165\u6d41\u7684\u6570\u636e\u5199\u51fa\u5230\u8f93\u51fa\u6d41\u4e2d\n        ServletOutputStream sos = response.getOutputStream();\n        byte&#91;] buff = new byte&#91;1024 * 8];\n        int len = 0;\n        while((len = fis.read(buff)) != -1){\n            sos.write(buff,0,len);\n        }\n        fis.close();\n    }\n\n    protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {\n        this.doPost(request,response);\n    }\n}\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>servlet\u6587\u4ef6\u5b9e\u73b0\u6587\u4ef6\u4e0b\u8f7d, \u4e0d\u9700\u8981\u989d\u5916\u7684jar\u5305, \u6211\u4eec\u9700\u8981\u7406\u89e3\u7684\u662f \u5bf9\u4e8e\u6d4f\u89c8\u5668\u80fd\u89e3\u6790\u7684\u6587\u4ef6, \u9ed8\u8ba4\u4f1a\u88ab&hellip; <a href=\"https:\/\/www.52dixiaowo.com\/jsp\/post-19.html\" class=\"more-link\">\u7ee7\u7eed\u9605\u8bfb <span class=\"screen-reader-text\">servlet\u6587\u4ef6\u4e0b\u8f7d<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[2],"tags":[],"_links":{"self":[{"href":"https:\/\/www.52dixiaowo.com\/jsp\/wp-json\/wp\/v2\/posts\/19"}],"collection":[{"href":"https:\/\/www.52dixiaowo.com\/jsp\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.52dixiaowo.com\/jsp\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.52dixiaowo.com\/jsp\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.52dixiaowo.com\/jsp\/wp-json\/wp\/v2\/comments?post=19"}],"version-history":[{"count":2,"href":"https:\/\/www.52dixiaowo.com\/jsp\/wp-json\/wp\/v2\/posts\/19\/revisions"}],"predecessor-version":[{"id":21,"href":"https:\/\/www.52dixiaowo.com\/jsp\/wp-json\/wp\/v2\/posts\/19\/revisions\/21"}],"wp:attachment":[{"href":"https:\/\/www.52dixiaowo.com\/jsp\/wp-json\/wp\/v2\/media?parent=19"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.52dixiaowo.com\/jsp\/wp-json\/wp\/v2\/categories?post=19"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.52dixiaowo.com\/jsp\/wp-json\/wp\/v2\/tags?post=19"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}