{"id":5949,"date":"2024-04-17T00:41:13","date_gmt":"2024-04-16T16:41:13","guid":{"rendered":"http:\/\/zyg.luchers.cn\/?p=5949"},"modified":"2024-04-17T00:41:13","modified_gmt":"2024-04-16T16:41:13","slug":"%e4%b9%9d%e3%80%81el%e8%a1%a8%e8%be%be%e5%bc%8fjstl%e6%a0%87%e7%ad%be%e5%ba%93%e6%96%87%e4%bb%b6%e4%b8%8a%e4%bc%a0%e4%b8%8b%e8%bd%bd","status":"publish","type":"post","link":"http:\/\/zyg.luchers.cn\/index.php\/2024\/04\/17\/%e4%b9%9d%e3%80%81el%e8%a1%a8%e8%be%be%e5%bc%8fjstl%e6%a0%87%e7%ad%be%e5%ba%93%e6%96%87%e4%bb%b6%e4%b8%8a%e4%bc%a0%e4%b8%8b%e8%bd%bd\/","title":{"rendered":"\u4e5d\u3001EL\u8868\u8fbe\u5f0f&JSTL\u6807\u7b7e\u5e93&\u6587\u4ef6\u4e0a\u4f20\u4e0b\u8f7d"},"content":{"rendered":"

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package com.qt.pojo;\n\nimport java.util.Arrays;\nimport java.util.List;\nimport java.util.Map;\n\npublic class Person {\n    private String name;\n    private String[] phone;\n    private List<String> cities;\n    private Map<String,Object> map;\n    \/\/get\u548cset\u65b9\u6cd5\u3001\u6784\u9020\u5668\u6211\u8fd9\u91cc\u7701\u7565\u8981\u5199\u7684\n    public int getAge(){\n        return 18;\n    }\n}<\/code><\/pre>\n
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${12==12?"\u6d9b\u54e5\u5e05\u554a":"\u6d9b\u54e5\u4e0d\u5e05"}<\/code><\/pre>\n
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<c:if test="${12==12}">\n    <h1>12\u7b49\u4e8e12<\/h1>\n<\/c:if><\/code><\/pre>\n
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<%\n  request.setAttribute("height",151);\n%>\n<c:choose>\n    <c:when test="${requestScope.height>190}">\n        <h2>\u6211\u662f\u5c0f\u5de8\u4eba<\/h2>\n    <\/c:when>\n    <c:when test="${requestScope.height>180}">\n        <h2>\u662f\u6cb3\u5357\u4eba<\/h2>\n    <\/c:when>\n    <c:when test="${requestScope.height>170}">\n        <h2>\u6211\u662f\u666e\u901a\u4eba<\/h2>\n    <\/c:when>\n    <c:when test="${requestScope.height>160}">\n        <h2>\u6211\u662f\u597d\u4eba<\/h2>\n    <\/c:when>\n    <c:otherwise>\n        <c:choose>\n            <c:when test="${requestScope.height>150}">\n                <h2>\u6211\u662f\u4e2a\u4eba<\/h2>\n            <\/c:when>\n        <\/c:choose>\n    <\/c:otherwise>\n<\/c:choose><\/code><\/pre>\n
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7\u3001otherwise\u6807\u7b7e\uff1a\u5269\u4e0b\u7684\u60c5\u51b5\uff08default\uff09<\/p>\n
8\u3001\u6ce8\u610f<\/strong><\/p>\n
\uff081\uff09\u6807\u7b7e\u5185\u4e0d\u80fd\u4f7f\u7528html\u6ce8\u91ca\uff0c\u8981\u7528jsp\u7684<\/h5>\n
\uff082\uff09when\u6807\u7b7e\u5e93\u7684\u7236\u6807\u7b7e\u4e00\u5b9a\u8981\u662fchoose\u6807\u7b7e<\/h5>\n
4\u3001\\\u4f5c\u7528<\/h4>\n
1\u3001\u4f5c\u7528\uff1a\u904d\u5386\u8f93\u51fa<\/p>\n
2\u3001\u904d\u53861-10\uff0c\u8f93\u51fa\uff08\u4f8b\u5b50\uff09<\/p>\n
<%--  \u904d\u53861\u2014\u201410\u8f93\u51fa\n        begin\u5c5e\u6027\uff1a\u8bbe\u7f6e\u5f00\u59cb\u53d8\u91cf\n        end\u5c5e\u6027\uff1a\u8bbe\u7f6e\u7ed3\u675f\u53d8\u91cf\n        var \u5c5e\u6027\u8868\u793a\u5faa\u73af\u7684\u53d8\u91cf\uff08\u4e5f\u662f\u5f53\u524d\u6b63\u5728\u904d\u5386\u5230\u7684\u6570\u636e\uff09\n\n--%>\n    <table border="1">\n        <c:forEach begin="1" end="10" var="i">\n            <tr>\n                <td>\u7b2c${i}\u884c<\/td>\n            <\/tr>\n\n        <\/c:forEach>\n    <\/table><\/code><\/pre>\n
3\u3001\u904d\u5386Object\u6570\u7ec4<\/p>\n
<%--\n    \u904d\u5386Object\u6570\u7ec4\n    for(Object item:arr)\n    item \u8868\u793a\u904d\u5386\u7684\u6570\u636e\u6e90\uff08\u904d\u5386\u7684\u96c6\u5408\uff09\n    var \u8868\u793a\u5f53\u524d\u904d\u5386\u5230\u7684\u6570\u636e\n\n--%>\n    <%\n      request.setAttribute("arr",new String[]{"123456","7714813246","10086"});\n    %>\n    <c:forEach items="${requestScope.arr}" var="item">\n        ${item}<br>\n\n    <\/c:forEach><\/code><\/pre>\n
4\u3001\u904d\u5386Map \u96c6\u5408<\/p>\n
<%\n    Map<String,Object> map = new HashMap<>();\n    map.put("key1","value1");\n    map.put("key2","value2");\n    map.put("key3","value3");\n    map.put("key4","value4");\n\n    request.setAttribute("map",map);\n%>\n\n<c:forEach items="${requestScope.map}" var="entry">\n    <h1>${entry.key}=${entry.value}<\/h1>\n<\/c:forEach><\/code><\/pre>\n
5\u3001\u904d\u5386 List \u96c6\u5408---list \u4e2d\u5b58\u653e Student \u7c7b\uff0c\u6709\u5c5e\u6027\uff1a\u7f16\u53f7\uff0c\u7528\u6237\u540d\uff0c\u5bc6\u7801\uff0c\u5e74\u9f84\uff0c \u7535\u8bdd\u4fe1\u606f<\/p>\n
\uff081\uff09String\u7c7b<\/h5>\n
public class Student {\n\/\/    \u7f16\u53f7\uff0c\u7528\u6237\u540d\uff0c\u5bc6\u7801\uff0c\u5e74\u9f84\uff0c\u7535\u8bdd\u4fe1\u606f\n    private Integer id;\n    private String name;\n    private String password;\n    private Integer age;\n    private String phone;\n    get\u548cset\u548c\u6784\u9020\u5668\u548ctoString\u65b9\u6cd5\u7701\u7565\uff08\u81ea\u5df1\u5199\uff09<\/code><\/pre>\n
\uff082\uff09jsp\u4ee3\u7801<\/h5>\n
<%--\n    \u904d\u5386list\u96c6\u5408\n    \u7f16\u53f7\uff0c\u7528\u6237\u540d\uff0c\u5bc6\u7801\uff0c\u5e74\u9f84\uff0c\u7535\u8bdd\u4fe1\u606f\n\n--%>\n    <%\n        List<Student> studentList = new ArrayList<>();\n        for(int i=1;i<=10;i++){\n            studentList.add(new Student(i,"username"+i,"password"+i,18+i,"message"+i));\n        }\n        request.setAttribute("stus",studentList);\n    %>\n    <table border="1">\n        <tr>\n            <th>\u7f16\u53f7<\/th>\n            <th>\u7528\u6237\u540d<\/th>\n            <th>\u5bc6\u7801<\/th>\n            <th>\u5e74\u9f84<\/th>\n            <th>\u7535\u8bdd\u4fe1\u606f<\/th>\n            <th>\u64cd\u4f5c<\/th>\n        <\/tr>\n<%-- item \u8868\u793a\u904d\u5386\u7684\u96c6\u5408\n    var \u8868\u793a\u904d\u5386\u7684\u6570\u636e\n    begin\u8868\u793a\u904d\u5386\u7684\u5f00\u59cb\u7d22\u5f15\u503c\n    end \u8868\u793a\u904d\u5386\u7ed3\u675f\u7684\u7d22\u5f15\u503c\n    step \u5c5e\u6027\u8868\u793a\u904d\u5386\u7684\u6b65\u957f\u503c\uff0c\u76f8\u5173\u7684i++\uff0c\u9ed8\u8ba4\u662f1\n    varStatus \u5c5e\u6027\u8868\u793a\u5f53\u524d\u904d\u5386\u5230\u7684\u6570\u636e\u7684\u72b6\u6001\n    --%>\n    <c:forEach begin="2" end="7" step="1" varStatus="status" items="${requestScope.stus}" var="stu">\n<%--        <hr>--%>\n        <tr>\n            <td>${stu.id}<\/td>\n            <td>${stu.name}<\/td>\n            <td>${stu.password}<\/td>\n            <td>${stu.age}<\/td>\n            <td>${stu.phone}<\/td>\n            <td>${stu.phone}<\/td>\n            <td>${status}<\/td>\n            <td>\u5220\u9664\u3001\u4fee\u6539<\/td>\n        <\/tr>\n        ${stu}\n    <\/c:forEach>\n    <\/table><\/code><\/pre>\n
3\u3001\u6587\u4ef6\u4e0a\u4f20\u548c\u4e0b\u8f7d<\/h2>\n
3.1\u3001\u6587\u4ef6\u4e0a\u4f20\u7684\u4ecb\u7ecd<\/h3>\n
1\u3001\u8981\u6c42<\/h4>\n
1\u3001\u8981\u6709\u4e00\u4e2aform\u6807\u7b7e\uff0cmethod=post\u8bf7\u6c42<\/p>\n
2\u3001form\u6807\u7b7e\u7684encType\u5c5e\u6027\u503c\u5fc5\u987b\u4e3amultipart\/form-data\u503c<\/p>\n
3\u3001\u5728form\u6807\u7b7e\u4e2d\u4f7f\u7528input type=file \u6dfb\u52a0\u4e0a\u4f20\u6587\u4ef6<\/p>\n
4\u3001\u7f16\u5199\u670d\u52a1\u5668\u4ee3\u7801\uff08Servlet\uff09\u7a0b\u5e8f\u63a5\u6536\uff0c\u5904\u7406\u4e0a\u4f20\u7684\u6570\u636e<\/p>\n
5\u3001multipart\/form-data\u8868\u793a\u63d0\u4ea4\u6570\u636e\uff0c\u4ee5\u591a\u6bb5\uff08\u6bcf\u4e00\u4e2a\u8868\u5355\u9879\u4e00\u4e2a\u6570\u636e\u6bb5\uff09\u7684\u5f62\u5f0f\u8fdb\u884c\u62fc\u63a5\uff0c\u7136\u540e\u4ee5\u4e8c\u8fdb\u5236\u6d41\u7684\u5f62\u5f0f\u53d1\u9001\u7ed9\u670d\u52a1\u5668<\/strong><\/p>\n
3.2\u3001\u6587\u4ef6\u4e0a\u4f20\uff0cHTTP\u534f\u8bae\u7684\u8bf4\u660e<\/h3>\n
1\u3001\u5185\u5bb9<\/h4>\n
\"image-20230418163323114\"<\/div><\/p>\n
3.3\u3001commons-fileupload.jar \u5e38\u7528 API \u4ecb\u7ecd\u8bf4<\/h3>\n
1\u3001\u64cd\u4f5c<\/h4>\n
1\u3001\u9700\u8981\u5bfc\u5165\u4e24\u4e2ajar\u5305<\/p>\n
\"image-20230418163417031\"<\/div><\/p>\n
2\u3001\u8be5jar\u5305\u4e2d\u7684\u5e38\u7528\u7c7b<\/h4>\n\n\n\n\n\n\n\n\n\n\n\n\n\n
\u7c7b\u548c\u65b9\u6cd5<\/th>\n\u4f5c\u7528<\/th>\n<\/tr>\n<\/thead>\n
ServletFileUpload<\/td>\n\u89e3\u6790\u4e0a\u4f20\u6570\u636e<\/td>\n<\/tr>\n
FileItem<\/td>\n\u8868\u793a\u6bcf\u4e00\u4e2a\u8868\u5355\u9879<\/td>\n<\/tr>\n
boolean ServletFileUpload.isMultipartContent(HttpServletRequest request)<\/td>\n\u5224\u65ad\u5f53\u524d\u4e0a\u4f20\u6570\u636e\u683c\u5f0f\u662f\u5426\u4e3a\u591a\u6bb5\u5f0f<\/td>\n<\/tr>\n
public List\\parseRequest(HttpServletRequest request);<\/td>\n\u89e3\u6790\u4e0a\u4f20\u7684\u6570\u636e<\/td>\n<\/tr>\n
boolean FileItem.isFormField()<\/td>\n\u5224\u65ad\u5f53\u524d\u8fd9\u4e2a\u8868\u5355\u9879\uff0c\u662f\u5426\u662f\u666e\u901a\u7684\u8868\u5355\u9879\u3002\u8fd8\u662f\u4e0a\u4f20\u7684\u6587\u4ef6\u7c7b\u578b\u3002
 true \u8868\u793a\u666e\u901a\u7c7b\u578b\u7684\u8868\u5355\u9879
 false \u8868\u793a\u4e0a\u4f20\u7684\u6587\u4ef6\u7c7b\u578b<\/td>\n<\/tr>\n
String FileItem.getFieldName()<\/td>\n\u83b7\u53d6\u8868\u5355\u9879\u7684 name \u5c5e\u6027\u503c<\/td>\n<\/tr>\n
String FileItem.getString()<\/td>\n\u83b7\u53d6\u5f53\u524d\u8868\u5355\u9879\u7684\u503c\u3002<\/td>\n<\/tr>\n
String FileItem.getName();<\/td>\n\u83b7\u53d6\u4e0a\u4f20\u7684\u6587\u4ef6\u540d<\/td>\n<\/tr>\n
void FileItem.write( file );<\/td>\n\u5c06\u4e0a\u4f20\u7684\u6587\u4ef6\u5199\u5230 \u53c2\u6570 file \u6240\u6307\u5411\u62bd\u786c\u76d8\u4f4d\u7f6e \u3002<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
3\u3001Fileupload\u7c7b\u7684\u4f7f\u7528\uff08\u4f8b\u5b50\uff09<\/h4>\n
1\u3001jsp\u9875\u9762\u4ee3\u7801<\/p>\n
<form action="http:\/\/localhost:8080\/09_EL_JSTL\/uploadServlet" method="post" enctype="multipart\/form-data">\n  \u7528\u6237\u540d\uff1a<input type="text" name="username"\/><br>\n  \u5934\u50cf\uff1a<input type="file" id="photo"\/><br>\n      <input type="submit" name="sub" value="\u4e0a\u4f20"\/><br>\n\n<\/form><\/code><\/pre>\n
2\u3001servlet\u4ee3\u7801<\/p>\n
package com.qt.servlet;\n\nimport org.apache.commons.fileupload.FileItem;\nimport org.apache.commons.fileupload.FileItemFactory;\nimport org.apache.commons.fileupload.disk.DiskFileItemFactory;\nimport org.apache.commons.fileupload.servlet.ServletFileUpload;\n\nimport javax.servlet.ServletException;\nimport javax.servlet.ServletInputStream;\nimport javax.servlet.http.HttpServlet;\nimport javax.servlet.http.HttpServletRequest;\nimport javax.servlet.http.HttpServletResponse;\nimport java.io.File;\nimport java.io.IOException;\nimport java.util.List;\n\npublic class UploadServlet extends HttpServlet {\n    \/**\n     * \u7528\u6765\u5904\u7406\u6587\u4ef6\u4e0a\u4f20\u6570\u636e\n     * @param req\n     * @param resp\n     * @throws ServletException\n     * @throws IOException\n     *\/\n    @Override\n    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {\n\/\/        System.out.println("\u6587\u4ef6\u4e0a\u4f20\u4e86");\n\/\/\/\/        System.out.println(req.getParameter("username"));\n\/\/        ServletInputStream inputStream = req.getInputStream();\n\/\/        byte[] buffer = new byte[102400000];\n\/\/        int read = inputStream.read(buffer);\n\/\/        System.out.println( new String(buffer,0,read));\n\n\/\/        \u5224\u65ad\u6587\u4ef6\u4e0a\u4f20\u7684\u6570\u636e\u662f\u5426\u662f\u591a\u7aef\u6570\u636e\uff08\u53ea\u6709\u591a\u7aef\u6570\u636e\uff0c\u624d\u662f\u6587\u4ef6\u4e0a\u4f20\u7684\uff09\n        if(ServletFileUpload.isMultipartContent(req)){\n\n\/\/            \u521b\u5efaFileItemFactory\u5de5\u5382\u5b9e\u73b0\u7c7b\n            FileItemFactory fileItemFactory = new DiskFileItemFactory();\n\/\/            \u521b\u5efa\u7528\u8bed\u89e3\u6790\u4e0a\u4f20\u6570\u636e\u7684\u5de5\u5177\u7c7bServletFileUpload\n            ServletFileUpload servletFileUpload = new ServletFileUpload(fileItemFactory);\n            try {\n\/\/                \u89e3\u6790\u4e0a\u4f20\u7684\u6570\u636e\uff0c\u5f97\u5230\u6bcf\u4e2a\u8868\u5355\u9879FileItem\n                List<FileItem> list = servletFileUpload.parseRequest(req);\n\/\/                \u5faa\u73af\u5224\u65ad\uff0c\u6bcf\u4e2a\u8868\u5355\u9879\uff0c\u662f\u666e\u901a\u7c7b\u578b\uff0c\u8fd8\u662f\u6587\u4ef6\u4e0a\u4f20\u7c7b\u578b\n                for (FileItem fileItem :list){\n                    if(fileItem.isFormField()){\n\/\/                        \u666e\u901a\u8868\u5355\u9879\n                        System.out.println("\u8868\u5355\u9879\u7684name\u5c5e\u6027\uff1a"+fileItem.getFieldName());\n                        System.out.println("\u8868\u5355\u9879\u7684value\u5c5e\u6027\uff1a"+fileItem.getString("UTF-8"));\n                    }else {\n\/\/                        \u4e0a\u4f20 \u6587\u4ef6\n                        System.out.println("\u8868\u5355\u7684name\u5c5e\u6027\u503c\uff1a"+fileItem.getFieldName());\n                        System.out.println("\u4e0a\u4f20\u7684\u6587\u4ef6\u540d\uff1a"+fileItem.getName());\n\n                        fileItem.write(new File("E:\\\\"+fileItem.getName()));\n                    }\n                }\n            }catch (Exception e){\n                e.printStackTrace();\n            }\n\n        }\n    }\n\n}<\/code><\/pre>\n
3.4\u3001\u6587\u4ef6\u4e0b\u8f7d<\/h3>\n
1\u3001\u4e0b\u8f7d\u7684\u5e38\u7528AIP<\/h4>\n
1\u3001\u5185\u5bb9<\/p>\n
\"image-20230418164238181\"<\/div><\/p>\n
2\u3001response.setHeader("Content-Disposition", "attachment; fileName=1.jpg"); <\/p>\n
\uff081\uff09\u8fd9\u4e2a\u54cd\u5e94\u5934\u544a\u8bc9\u6d4f\u89c8\u5668\u3002\u8fd9\u662f\u9700\u8981\u4e0b\u8f7d\u7684\u3002<\/p>\n
\uff082\uff09 attachment \u8868\u793a\u9644\u4ef6\uff0c\u4e5f\u5c31\u662f\u4e0b\u8f7d\u7684\u4e00\u4e2a\u6587\u4ef6\u3002<\/p>\n
\uff083\uff09fileName=\u540e\u9762\uff0c \u8868\u793a\u4e0b\u8f7d\u7684\u6587\u4ef6\u540d\u3002<\/p>\n
3.5\u3001attachment \u9644\u4ef6\u89e3\u51b3\u4e2d\u6587\u4e71\u7801\u95ee\u9898\u7684\u65b9\u6848<\/h3>\n
1\u3001URLEncoder \u89e3\u51b3 IE \u548c\u8c37\u6b4c\u6d4f\u89c8\u5668\u7684 \u9644\u4ef6\u4e2d \u6587\u540d\u95ee\u9898<\/h4>\n
1\u3001\u4f7f\u7528\u7684\u662fIE\u6d4f\u89c8\u5668\u6216\u8005\u8c37\u6b4c\u6d4f\u89c8\u5668<\/p>\n
2\u3001\u4f8b\u5b50<\/p>\n
resp.setHeader("Content-Disposition","attachment;filename="+ URLEncoder.encode("\u5927\u7f8e\u5973.jpg","UTF-8"));\n\/\/Content-Disposition\uff1a\u8868\u793a\u6536\u5230\u7684\u6570\u636e\u600e\u4e48\u5904\u7406\n\/\/        attachment\uff1a\u8868\u793a\u9644\u4ef6\uff0c\u8868\u793a\u4e0b\u8f7d\u4f7f\u7528\n\/\/        filename\uff1a\u8bbe\u7f6e\u6587\u4ef6\u540d\u5b57\uff0c\u9ed8\u8ba4\u662f\u4f7f\u7528\u82f1\u6587\n\/\/        URL\u7f16\u7801\u662f\u628a\u6c49\u5b57\u8f6c\u5316\u4e3a%xx%xx\u7684\u683c\u5f0f<\/code><\/pre>\n
2\u3001BASE64 \u7f16\u89e3\u7801 \u89e3\u51b3 \u706b\u72d0\u6d4f\u89c8\u5668\u7684\u9644\u4ef6\u4e2d\u6587\u540d\u95ee\u9898<\/h4>\n
1\u3001\u4f7f\u7528BASE64 \u7f16\u89e3\u7801\u9700\u8981\u5bfc\u5305<\/p>\n
2\u3001\u683c\u5f0f<\/p>\n
\"image-20230418165133901\"<\/div><\/p>\n
3\u3001\u89e3\u51b3\u6d4f\u89c8\u5668\u517c\u5bb9\u95ee\u9898\u65b9\u6848\uff08\u4f8b\u5b50\uff09<\/p>\n
\"image-20230418165437325\"<\/div><\/p>\n","protected":false},"excerpt":{"rendered":"
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