浅谈如何实现JSP上传图片无组件化
创始人
2024-04-12 07:01:12
0次
从JSP页使图片以JPEG编码后存储在指定文件夹中。这种JSP上传图片方式与组件上传相比似乎笨拙而又不能对文件属性进行操作，但的确可以轻松实现JSP上传图片的功能。
uploadimage1.jsp实现构建一个表单，提交用于为图片重命名的参数，以及图片文件。
- <%...@ page contentType="text/html; charset=gbk" %>
- <%...@ page language="java" %>
</FONT></STRONG>DATABASE<STRONG><FONT color=#006699></< SPAN>TITLE></FONT></STRONG> <LI><STRONG><FONT color=#006699><meta</FONT></STRONG> <FONT color=#ff0000>http-equiv</FONT>=<FONT color=#0000ff>"Content-Type"</FONT> <FONT color=#ff0000>content</FONT>=<FONT color=#0000ff>"text/html; charset=gb2312"</FONT><STRONG><FONT color=#006699>></FONT></STRONG> <LI class=alt><STRONG><FONT color=#006699></< SPAN>HEAD></FONT></STRONG> <LI><STRONG><FONT color=#006699><FORM</FONT></STRONG> <FONT color=#ff0000>METHOD</FONT>=<FONT color=#0000ff>POST</FONT> <FONT color=#ff0000>ACTION</FONT>=<FONT color=#0000ff>"uploadimage2.jsp"</FONT><STRONG><FONT color=#006699>></FONT></STRONG> <LI class=alt>人物:<STRONG><FONT color=#006699><INPUT</FONT></STRONG> <FONT color=#ff0000>TYPE</FONT>=<FONT color=#0000ff>"text"</FONT> <FONT color=#ff0000>NAME</FONT>=<FONT color=#0000ff>"name"</FONT><STRONG><FONT color=#006699>><BR></FONT></STRONG> <LI>图片:<STRONG><FONT color=#006699><INPUT</FONT></STRONG> <FONT color=#ff0000>TYPE</FONT>=<FONT color=#0000ff>"file"</FONT> <FONT color=#ff0000>NAME</FONT>=<FONT color=#0000ff>"image"</FONT><STRONG><FONT color=#006699>><BR></FONT></STRONG> <LI class=alt><STRONG><FONT color=#006699><INPUT</FONT></STRONG> <FONT color=#ff0000>TYPE</FONT>=<FONT color=#0000ff>"submit"</FONT> <FONT color=#ff0000>value</FONT>=<FONT color=#0000ff>"提交"</FONT><STRONG><FONT color=#006699>></FONT></STRONG> <LI><STRONG><FONT color=#006699></< SPAN>FORM></FONT></STRONG> <LI class=alt><STRONG><FONT color=#006699></< SPAN>BODY></FONT></STRONG> <LI><STRONG><FONT color=#006699></< SPAN>HTML></FONT></STRONG> </LI></OL></PRE> <P>uploadimage1.jsp实现获取用户提交参数为要存储的图片命名，以字符的形式获取上传的图片，进一步转化为输入流，最终完成JSP上传图片的功能。</P><PRE><OL class=dp-xml><LI class=alt><STRONG><FONT color=#006699><</FONT></STRONG>%...@ page <FONT color=#ff0000>contentType</FONT>=<FONT color=#0000ff>"text/html;charset=gb2312"</FONT>%<STRONG><FONT color=#006699>></FONT></STRONG> <LI><STRONG><FONT color=#006699><</FONT></STRONG>%...@ page <FONT color=#ff0000>import</FONT>=<FONT color=#0000ff>"java.util.*"</FONT>%<STRONG><FONT color=#006699>></FONT></STRONG> <LI class=alt><STRONG><FONT color=#006699><</FONT></STRONG>%...@ page <FONT color=#ff0000>import</FONT>=<FONT color=#0000ff>"java.text.*"</FONT>%<STRONG><FONT color=#006699>></FONT></STRONG> <LI><STRONG><FONT color=#006699><</FONT></STRONG>%...@ page <FONT color=#ff0000>import</FONT>=<FONT color=#0000ff>"java.io.*"</FONT>%<STRONG><FONT color=#006699>></FONT></STRONG> <LI class=alt><STRONG><FONT color=#006699><</FONT></STRONG>%...@ page <FONT color=#ff0000>import</FONT>=<FONT color=#0000ff>"com.sun.image.codec.jpeg.*"</FONT>%<STRONG><FONT color=#006699>></FONT></STRONG> <LI><STRONG><FONT color=#006699><</FONT></STRONG>%...@ page <FONT color=#ff0000>import</FONT>=<FONT color=#0000ff>"java.awt.image.*"</FONT>%<STRONG><FONT color=#006699>></FONT></STRONG> <LI class=alt><STRONG><FONT color=#006699><</FONT></STRONG>%...@ page <FONT color=#ff0000>import</FONT>=<FONT color=#0000ff>"java.awt.*"</FONT>%<STRONG><FONT color=#006699>></FONT></STRONG> <LI> <LI class=alt><STRONG><FONT color=#006699><</FONT></STRONG>%... <LI> String <FONT color=#ff0000>name</FONT>=<FONT color=#0000ff>request</FONT>.getParameter("name"); <LI class=alt> <FONT color=#ff0000>name</FONT>=<FONT color=#0000ff>new</FONT> String(name.getBytes("ISO-8859-1")); <LI> String <FONT color=#ff0000>ima</FONT>=<FONT color=#0000ff>request</FONT>.getParameter("image"); <LI class=alt> <LI> try{ <LI class=alt> String <FONT color=#ff0000>path</FONT>=<FONT color=#0000ff>request</FONT>.getRealPath("/"); <LI> FileOutputStream <FONT color=#ff0000>ot</FONT> = <FONT color=#0000ff>new</FONT> FileOutputStream(path+name+".jpg"); <LI class=alt>// ServletOutputStream <FONT color=#ff0000>ot</FONT>=<FONT color=#0000ff>response</FONT>.getOutputStream(); //也可以直接输出显示 <LI> FileInputStream <FONT color=#ff0000>in</FONT>=<FONT color=#0000ff>new</FONT> FileInputStream(ima); <LI class=alt> JPEGImageDecoder <FONT color=#ff0000>jpgCodec</FONT> = <FONT color=#0000ff>JPEGCodec</FONT>.createJPEGDecoder(in); <LI> BufferedImage <FONT color=#ff0000>image</FONT> = <FONT color=#0000ff>jpgCodec</FONT>.decodeAsBufferedImage(); <LI class=alt> JPEGImageEncoder <FONT color=#ff0000>encoder</FONT>=<FONT color=#0000ff>JPEGCodec</FONT>.createJPEGEncoder(ot); <LI> encoder.encode(image); <LI class=alt> in.close(); <LI> ot.close(); <LI class=alt> out.print("JSP上传图片成功！<STRONG><FONT color=#006699><BR></FONT></STRONG>"); <LI> //加载上传成功的图片 <LI class=alt> out.print("<STRONG><FONT color=#006699><IMG</FONT></STRONG> <FONT color=#ff0000>width</FONT>=<FONT color=#0000ff>200</FONT> <FONT color=#ff0000>height</FONT>=<FONT color=#0000ff>200</FONT> <FONT color=#ff0000>src</FONT>=<FONT color=#0000ff>'"+name+".jpg'</FONT> <STRONG><FONT color=#006699>/></FONT></STRONG>"); <LI>} <LI class=alt>catch(Exception e) <LI>{ <LI class=alt>System.out.print(e.toString()); <LI>} <LI class=alt>%<STRONG><FONT color=#006699>></FONT></STRONG> </LI></OL></PRE> <P>实现JSP上传图片无组件化就为大家介绍到这里。</P> <P>【编辑推荐】</P> <OL> <LI>浅谈利用jspsmart实现文件上传下载</FONT></FONT></LI> <LI><FONT color=#0000ff>使用JSP页面生成PDF报表</FONT></LI> <LI><FONT color=#0000ff>JSP自定义标签定义步骤</FONT></LI> <LI><FONT color=#0000ff>详解测试JSP容器</FONT></LI> <LI><FONT color=#0000ff>介绍JSP HTTP服务器实现的以下特性</FONT></LI></OL> <!--end::Text--> </div> <!--end::Description--> <div class="mt-5"> <!--关键词搜索--> </div> <div class="mt-5"> <p class="fc-show-prev-next"> <strong>上一篇：</strong><a href="/chengxu/14143.html">Servlet API的强筋实力</a><br> </p> <p class="fc-show-prev-next"> <strong>下一篇：</strong><a href="/chengxu/14145.html">cc(ChallengeCollapsar)攻击数据小结</a> </p> </div> <!--begin::Block--> <div class="d-flex flex-stack mb-2 mt-10"> <!--begin::Title--> <h3 class="text-dark fs-5 fw-bold text-gray-800">相关内容</h3> <!--end::Title--> </div> <div class="separator separator-dashed mb-9"></div> <!--end::Block--> <div class="row g-10"> </div> </div> <!--end::Table widget 14--> 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