Java doGet, doPost方法和文件上传实例代码
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2024-03-11 19:48:13
java doget, dopost方法和文件上传
index.html
java doget, dopost方法和文件上传
index.html
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>title</title>
</head>
<body>
<form action="/test" method="post" enctype="multipart/form-data">
<table >
<tr>
<td>
用户名:
</td>
<td>
<input name="username" type="text">
</td> <tr>
<td>
密  码:
</td>
<td colspan="2">
<input name="password" type="password">
</td>
</tr>
<tr align="center">
<td><input name="login" type="submit" value="登陆"></td>
<td><input name="register" type="reset" value="重置"></td>
</tr>
<tr>
<td colspan="2">
<input type="radio" name="sex" value="male">男
</td> <td colspan="2">
<input type="radio" name="sex" value="female">女
</td>
</tr>
<tr>
<td colspan="2" >
<input name="upload" type="file">
</td>
</tr>
</table>
</form>
</body>
</html>
testservlet.java
import org.apache.commons.fileupload.fileitem;
import org.apache.commons.fileupload.fileuploadexception;
import org.apache.commons.fileupload.disk.diskfileitemfactory;
import org.apache.commons.fileupload.servlet.servletfileupload;
import javax.servlet.servletexception;
import javax.servlet.servletinputstream;
import javax.servlet.servletoutputstream;
import javax.servlet.annotation.webservlet;
import javax.servlet.http.httpservlet;
import javax.servlet.http.httpservletrequest;
import javax.servlet.http.httpservletresponse;
import java.io.bytearrayoutputstream;
import java.io.file;
import java.io.ioexception;
import java.net.urldecoder;
import java.net.urlencoder;
import java.util.enumeration;
import java.util.list;
/**
* project: day15_web
* created: lulu
* date: 2016/8/16
*/
@webservlet(name = "testservlet")
public class testservlet extends httpservlet {
private file root_upload;
public testservlet() {
root_upload = new file("c:/temp");
if (!root_upload.exists()) {
root_upload.mkdirs();
}
}
//两种链接方式 dopost doget
protected void dopost(httpservletrequest request, httpservletresponse response) throws servletexception, ioexception {
response.setcharacterencoding("utf-8");
request.setcharacterencoding("utf-8");
servletoutputstream os = response.getoutputstream();
stringbuilder builder = new stringbuilder();
builder.append("<html>");
builder.append("<head>");
builder.append(" <meta charset=\"utf-8\">");
builder.append(" <title>测试servlet</title>");
builder.append("</head>");
builder.append("<body>");
enumeration<string> names = request.getheadernames();
while (names.hasmoreelements()) {
string name = names.nextelement();
builder.append(name)
.append(":")
.append(request.getheader(name))
.append("<br>");
}
diskfileitemfactory factory = new diskfileitemfactory();
factory.setsizethreshold(10);//设置未保存在临时路径的最大值
factory.setrepository(new file("c:/temp/temp"));//超过上述最大值后保存的临时路径
servletfileupload upload = new servletfileupload(factory);
try {
list<fileitem> list = upload.parserequest(request);//上传的文件列表
for (fileitem item : list) {
builder.append(item.getfieldname())
.append(":")
.append(item.isformfield() ? item.getstring() : item.getname())//判断是不是属性, 如果是属性, 就
.append("<br>");
if (!item.isformfield()) {
file file = new file(root_upload, item.getname());
builder.append(file.getabsolutepath()).append("<br>");
item.write(file);
}
}
} catch (fileuploadexception e) {
e.printstacktrace();
} catch (exception e) {
e.printstacktrace();
}
//可以从输入流中读取数据
// servletinputstream is = request.getinputstream();
// byte[] buffer = new byte[8192];
// int len ;
// bytearrayoutputstream bos= new bytearrayoutputstream();
// while ((len = is.read(buffer)) != -1) {
// bos.write(buffer, 0, len);
// }
// builder.append("inputstream: ")
// .append(bos.tostring("utf-8"))
// .append("<br>");
// builder.append("<h1>post的请求参数</h1>").append("<br/>");
//
// enumeration<string> parameternames = request.getparameternames();
// while (parameternames.hasmoreelements()) {
// string name = parameternames.nextelement();
// builder.append(name)
// .append(":")
// .append(request.getparameter(name))
// .append("<br/>");
// }
//接收来自浏览器的文件,
os.write(builder.tostring().getbytes("utf-8"));
//参数列表: 待转码的字符串, 字符编码
urlencoder.encode("&", "utf-8");
urldecoder.decode("%26", "utf-8");
builder.append("</body>");
builder.append("</html>");
}
protected void doget(httpservletrequest request, httpservletresponse response) throws servletexception, ioexception {
dopost(request, response);
}
}
web.xml
<?xml version="1.0" encoding="utf-8"?>
<web-app xmlns="http://xmlns.jcp.org/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/xmlschema-instance"
xsi:schemalocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
version="3.1">
<servlet>
<servlet-name>testservlet</servlet-name>
<servlet-class>org.lulu.learn.testservlet</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>testservlet</servlet-name>
<url-pattern>/test</url-pattern>
</servlet-mapping>
</web-app>
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