.java文件寫(xiě)接口：
package com.byron.learnservlet;
import com.google.gson.*;
import org.dom4j.*;
import org.apache.commons.fileupload.FileItem;
import org.apache.commons.fileupload.FileUploadBase;
import org.apache.commons.fileupload.ProgressListener;
import org.apache.commons.fileupload.disk.DiskFileItemFactory;
import org.apache.commons.fileupload.servlet.ServletFileUpload;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.FileReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.util.Enumeration;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.UUID;
import javax.servlet.ServletConfig;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
public class ServletHelloworld extends HttpServlet {
private BufferedReader br;
@Override
public void init() throws ServletException {
// TODO Auto-generated method stub
System.out.println("init");
super.init();
}
@Override
public void init(ServletConfig config) throws ServletException {
// TODO Auto-generated method stub
super.init(config);
System.out.println("initconfig");
}
@Override
protected void service(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
// TODO Auto-generated method stub
super.service(req, resp);
System.out.println("service");
}
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
// TODO Auto-generated method stub
// super.doGet(req, resp);
System.out.println("doGet");
try {
handlereq(req,resp);
} catch (DocumentException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
// TODO Auto-generated method stub
// super.doPost(req, resp);
System.out.println("doPost");
try {
handlereq(req,resp);
} catch (DocumentException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
void handlereq(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException, DocumentException {
System.out.println(req.getServletPath());// /hello
System.out.println(req.getMethod()); // GET
System.out.println(req.getRequestURL()); // http://localhost:8888/learnjsp1/hello
// System.out.println(req.getRequestURI()); // /learnjsp1/hello
// System.out.println("123"+req.getCharacterEncoding()); // /learnjsp1/hello
// System.out.println("456"+req.getContentType()); // /learnjsp1/hello
//讀取請(qǐng)求參數(shù)相關(guān)代碼
//req.getParameterNames().hasMoreElements()排除無(wú)參數(shù)請(qǐng)求報(bào)錯(cuò)問(wèn)題
System.out.println("開(kāi)始處理請(qǐng)求");
// req.setCharacterEncoding("UTF-8");
// resp.setCharacterEncoding("UTF-8");
// resp.setContentType("text/html;charset=utf-8");
if(!req.getServletPath().contains("/hello4")&&(req.getParameterNames().hasMoreElements())) {
if(req.getParameterNames().nextElement().contains("<")) {
//讀取請(qǐng)求參數(shù)
Enumeration<String> em = req.getParameterNames();
String name = (String) em.nextElement();
String value = req.getParameter(name);
String xmlstr = name+"="+value;
System.out.println("xmlstr:"+xmlstr);
Document document = DocumentHelper.parseText(xmlstr);
//獲取根節(jié)點(diǎn)元素對(duì)象
Element root = document.getRootElement();
//遍歷
listNodes(root);
}else {
//json讀取請(qǐng)求參數(shù)
Enumeration<String> em = req.getParameterNames();
while (em.hasMoreElements()) {
String name = (String) em.nextElement();
String value = req.getParameter(name);
System.out.println(name+"="+value);
}
//json通過(guò)map讀取參數(shù)
Map<String,String[]> map = req.getParameterMap();
Set<String> keys = map.keySet();
for(String key:keys ) {
String[] value = map.get(key);
System.out.println(key+"="+value[0]);
}
}
}
if(req.getServletPath().contains("/hello1")) {//給請(qǐng)求返回字符串
// 返回字符串
PrintWriter out = resp.getWriter();
out.println("fds");
out.close();
}
if(req.getServletPath().contains("/hello5")) {//給請(qǐng)求返回本地文件內(nèi)容
String path ="/Users/bangqizhineng/Desktop/自己的文檔/javacode"; // 這邊文件目錄需改成相對(duì)路徑
File file = new File(path,"臺(tái)灣王公館.json");
FileReader fr = new FileReader(file); //字符輸入流
br = new BufferedReader(fr);
String str = br.readLine();
PrintWriter out = resp.getWriter();
out.println(str);
out.close();
}
if(req.getServletPath().contains("/hello6")) {//給請(qǐng)求返回本地文件內(nèi)容
resp.setContentType("image/png");
resp.setCharacterEncoding("utf-8");
String path ="/Users/bangqizhineng/Desktop/自己的文檔/javacode/.metadata/.plugins/org.eclipse.wst.server.core/tmp0/wtpwebapps/learnjsp1/WebContent/WEB-INF/c13b2a16-8a18-4696-a580-6ab88c5bd7ad_1.jpg"; // 這邊文件目錄需改成相對(duì)路徑
FileInputStream fis = null;
File file = new File(path);
fis = new FileInputStream(file);
byte[] b = new byte[fis.available()];
fis.read(b);
OutputStream out = resp.getOutputStream();
out.write(b);
out.flush();
}
if(req.getServletPath().contains("/hello2")) {//json get post請(qǐng)求
//返回json
JsonObject responseJSONObject=new JsonObject();
responseJSONObject.addProperty("name","xuanyouwu尖峰時(shí)刻");
resp.setContentType("application/json; charset=utf-8");
PrintWriter out = resp.getWriter();
out.append(responseJSONObject.toString());
out.close();
}
if(req.getServletPath().contains("/hello3")) {//xml post 請(qǐng)求
Document xmldom = DocumentHelper.createDocument();
Element root = DocumentHelper.createElement("students");
xmldom.setRootElement(root);
root.addAttribute("name", "liming");
Element root1 = root.addElement("goodstudent");
root1.addAttribute("sort", "first").addAttribute("sort1", "first");
root1.addText("1");
//連續(xù)添加兩個(gè)子節(jié)點(diǎn)
root1.addElement("3").addAttribute("3-1", "3").addAttribute("3-2", "3").addElement("4").addAttribute("4-1", "3").addAttribute("4-2", "3");
resp.setContentType("text/xml; charset=utf-8");
PrintWriter out = resp.getWriter();
out.append(xmldom.asXML());
out.close();
}
if(req.getServletPath().contains("/hello4")) {
//得到上傳文件的保存目錄，將上傳的文件存放于WEB-INF目錄下有巧，不允許外界直接訪問(wèn)，保證上傳文件的安全
String savePath = this.getServletContext().getRealPath("/WebContent/WEB-INF");
//上傳時(shí)生成的臨時(shí)文件保存目錄
String tempPath = this.getServletContext().getRealPath("tem");
File tmpFile = new File(tempPath);
if (!tmpFile.exists()) {
//創(chuàng)建臨時(shí)目錄
tmpFile.mkdir();
}
//消息提示
String message = "";
try{
//使用Apache文件上傳組件處理文件上傳步驟：
//1、創(chuàng)建一個(gè)DiskFileItemFactory工廠
DiskFileItemFactory factory = new DiskFileItemFactory();
//設(shè)置工廠的緩沖區(qū)的大小闷叉，當(dāng)上傳的文件大小超過(guò)緩沖區(qū)的大小時(shí)谅海，就會(huì)生成一個(gè)臨時(shí)文件存放到指定的臨時(shí)目錄當(dāng)中赌朋。
factory.setSizeThreshold(1024*1000);//設(shè)置緩沖區(qū)的大小為100KB，如果不指定卫漫，那么緩沖區(qū)的大小默認(rèn)是10KB
//設(shè)置上傳時(shí)生成的臨時(shí)文件的保存目錄
factory.setRepository(tmpFile);
//2、創(chuàng)建一個(gè)文件上傳解析器
ServletFileUpload upload = new ServletFileUpload(factory);
//監(jiān)聽(tīng)文件上傳進(jìn)度
upload.setProgressListener(new ProgressListener(){
public void update(long pBytesRead, long pContentLength, int arg2) {
System.out.println("文件大小為：" + pContentLength + ",當(dāng)前已處理：" + pBytesRead);
/**
* 文件大小為：14608,當(dāng)前已處理：4096
文件大小為：14608,當(dāng)前已處理：7367
文件大小為：14608,當(dāng)前已處理：11419
文件大小為：14608,當(dāng)前已處理：14608
*/
float f = pBytesRead/pContentLength;
// try {
// resp.getWriter().write(f+"");
// } catch (IOException e) {
// // TODO Auto-generated catch block
// e.printStackTrace();
// }
}
});
//解決上傳文件名的中文亂碼
upload.setHeaderEncoding("UTF-8");
//3肾砂、判斷提交上來(lái)的數(shù)據(jù)是否是上傳表單的數(shù)據(jù)
if(!ServletFileUpload.isMultipartContent(req)){
//按照傳統(tǒng)方式獲取數(shù)據(jù)
return;
}
//設(shè)置上傳單個(gè)文件的大小的最大值汛兜，目前是設(shè)置為1024*1024字節(jié)，也就是1MB
upload.setFileSizeMax(1024*1024);
//設(shè)置上傳文件總量的最大值通今，最大值=同時(shí)上傳的多個(gè)文件的大小的最大值的和粥谬，目前設(shè)置為10MB
upload.setSizeMax(1024*1024*10);
//4、使用ServletFileUpload解析器解析上傳數(shù)據(jù)辫塌，解析結(jié)果返回的是一個(gè)List<FileItem>集合漏策，每一個(gè)FileItem對(duì)應(yīng)一個(gè)Form表單的輸入項(xiàng)
List<FileItem> list = upload.parseRequest(req);
System.out.println(list.size());
for(FileItem item : list){
//如果fileitem中封裝的是普通輸入項(xiàng)的數(shù)據(jù)
if(item.isFormField()){
String name = item.getFieldName();
//解決普通輸入項(xiàng)的數(shù)據(jù)的中文亂碼問(wèn)題
String value = item.getString("UTF-8");
//value = new String(value.getBytes("iso8859-1"),"UTF-8");
System.out.println(name + "=" + value);
}else{//如果fileitem中封裝的是上傳文件
//得到上傳的文件名稱，
String filename = item.getName();
System.out.println("上傳的文件名稱"+filename);
if(filename==null || filename.trim().equals("")){
continue;
}
//注意：不同的瀏覽器提交的文件名是不一樣的臼氨，有些瀏覽器提交上來(lái)的文件名是帶有路徑的掺喻，如： c:\a\b\1.txt，而有些只是單純的文件名储矩，如：1.txt
//處理獲取到的上傳文件的文件名的路徑部分感耙，只保留文件名部分
filename = filename.substring(filename.lastIndexOf("\\")+1);
//得到上傳文件的擴(kuò)展名
String fileExtName = filename.substring(filename.lastIndexOf(".")+1);
//如果需要限制上傳的文件類型，那么可以通過(guò)文件的擴(kuò)展名來(lái)判斷上傳的文件類型是否合法
System.out.println("上傳的文件的擴(kuò)展名是："+fileExtName);
//得到文件保存的名稱
String saveFilename = makeFileName(filename);
//得到文件的保存目錄
String realSavePath = savePath + "/" + saveFilename;
/*保存文件方法11111:*/
// File storeFile = new File(realSavePath);
// // 在控制臺(tái)輸出文件的上傳路徑
// System.out.println(realSavePath);
// // 保存文件到硬盤(pán)
// item.write(storeFile);
/*保存文件方法222222:*/
//獲取item中的上傳文件的輸入流
InputStream in = item.getInputStream();
//創(chuàng)建一個(gè)文件輸出流
FileOutputStream out = new FileOutputStream(realSavePath);
//創(chuàng)建一個(gè)緩沖區(qū)
byte buffer[] = new byte[1024];
//判斷輸入流中的數(shù)據(jù)是否已經(jīng)讀完的標(biāo)識(shí)
int len = 0;
//循環(huán)將輸入流讀入到緩沖區(qū)當(dāng)中持隧，(len=in.read(buffer))>0就表示in里面還有數(shù)據(jù)
while((len=in.read(buffer))>0){
//使用FileOutputStream輸出流將緩沖區(qū)的數(shù)據(jù)寫(xiě)入到指定的目錄(savePath + "\\" + filename)當(dāng)中
out.write(buffer, 0, len);
}
//關(guān)閉輸入流
in.close();
//關(guān)閉輸出流
out.close();
//刪除處理文件上傳時(shí)生成的臨時(shí)文件
item.delete();
System.out.println("文件上傳成功即硼！");
message = "文件上傳成功！";
}
}
}catch (FileUploadBase.FileSizeLimitExceededException e) {
message= "單個(gè)文件超出最大值Ｂ挪ΑＶ凰帧！";
e.printStackTrace();
return;
}catch (FileUploadBase.SizeLimitExceededException e) {
message= "上傳文件的總的大小超出限制的最大值Ｑ嚼恰Ａ言省！";
e.printStackTrace();
return;
}catch (Exception e) {
System.out.println("文件上傳失敻缤А绝编！");
message= "文件上傳失敗！";
e.printStackTrace();
}
JsonObject responseJSONObject=new JsonObject();
responseJSONObject.addProperty("message","amfdsf555我的你");
resp.setCharacterEncoding("utf-8");
resp.setContentType("text/html;charset=utf-8");
/*注意：前后端搭配
* resp.setContentType("text/html;charset=utf-8");
* mgr.responseSerializer = [AFHTTPResponseSerializer serializer];
* NSString *shabi = [[NSString alloc]initWithData:json encoding:NSUTF8StringEncoding];
* */
/*注意：前后端搭配
* resp.setContentType("application/json; charset=utf-8");
* mgr.responseSerializer = [ AFJSONResponseSerializer serializer];
* NSDictionary *dic = (NSDictionary *)json;
* */
System.out.println("dsds"+responseJSONObject.toString());
resp.getWriter().append(responseJSONObject.toString());
req.setAttribute("message",message);
//返回json
// JsonObject responseJSONObject=new JsonObject();
// responseJSONObject.addProperty("message",message);
//// resp.setCharacterEncoding("utf-8");
//// resp.setContentType("text/html;charset=utf-8");
//// resp.setContentType("application/json; charset=utf-8");
// PrintWriter outwriter = resp.getWriter();
// outwriter.append("11");
// outwriter.close();
}
}
//遍歷當(dāng)前節(jié)點(diǎn)下的所有節(jié)點(diǎn)
public void listNodes(Element node){
System.out.println("當(dāng)前節(jié)點(diǎn)的名稱：" + node.getName());
//首先獲取當(dāng)前節(jié)點(diǎn)的所有屬性節(jié)點(diǎn)
List<Attribute> list = node.attributes();
//遍歷屬性節(jié)點(diǎn)
for(Attribute attribute : list){
System.out.println("屬性"+attribute.getName() +":" + attribute.getValue());
}
//如果當(dāng)前節(jié)點(diǎn)內(nèi)容不為空十饥，則輸出
if(!(node.getTextTrim().equals(""))){
System.out.println( node.getName() + "：" + node.getText());
}
//同時(shí)迭代當(dāng)前節(jié)點(diǎn)下面的所有子節(jié)點(diǎn)
//使用遞歸
Iterator<Element> iterator = node.elementIterator();
while(iterator.hasNext()){
Element e = iterator.next();
listNodes(e);
}
}
/**
* @Method: makeFileName
* @Description: 生成上傳文件的文件名怎棱，文件名以：uuid+"_"+文件的原始名稱
* @Anthor:孤傲蒼狼
* @param filename 文件的原始名稱
* @return uuid+"_"+文件的原始名稱
*/
private String makeFileName(String filename){ //2.jpg
//為防止文件覆蓋的現(xiàn)象發(fā)生，要為上傳文件產(chǎn)生一個(gè)唯一的文件名
return UUID.randomUUID().toString() + "_" + filename;
}
/**
* 為防止一個(gè)目錄下面出現(xiàn)太多文件绷跑，要使用hash算法打散存儲(chǔ)
* @Method: makePath
* @Description:
* @Anthor:孤傲蒼狼
*
* @param filename 文件名拳恋，要根據(jù)文件名生成存儲(chǔ)目錄
* @param savePath 文件存儲(chǔ)路徑
* @return 新的存儲(chǔ)目錄
*/
private String makePath(String filename,String savePath){
//得到文件名的hashCode的值，得到的就是filename這個(gè)字符串對(duì)象在內(nèi)存中的地址
int hashcode = filename.hashCode();
int dir1 = hashcode&0xf; //0--15
int dir2 = (hashcode&0xf0)>>4; //0-15
//構(gòu)造新的保存目錄
String dir = savePath + "\\" + dir1 + "\\" + dir2; //upload\2\3 upload\3\5
//File既可以代表文件也可以代表目錄
File file = new File(dir);
//如果目錄不存在
if(!file.exists()){
//創(chuàng)建目錄
file.mkdirs();
}
return dir;
}
@Override
public void destroy() {
// TODO Auto-generated method stub
super.destroy();
System.out.println("destroy");
}
}
web.xml文件寫(xiě)：
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" version="3.0">
<display-name>learnjsp1</display-name>
<servlet>
<servlet-name>ServletHelloworld</servlet-name>
<servlet-class>com.byron.learnservlet.ServletHelloworld</servlet-class>
</servlet>
<servlet-mapping>
<servlet-name>ServletHelloworld</servlet-name>
<url-pattern>/</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>default</servlet-name>
<url-pattern>*.jpg</url-pattern>
</servlet-mapping>
<servlet-mapping>
<servlet-name>default</servlet-name>
<url-pattern>*.png</url-pattern>
</servlet-mapping>
<listener>
<listener-class>
org.apache.commons.fileupload.servlet.FileCleanerCleanup
</listener-class>
</listener>
<welcome-file-list>
<welcome-file>index.html</welcome-file>
<welcome-file>index.htm</welcome-file>
<welcome-file>index.jsp</welcome-file>
<welcome-file>default.html</welcome-file>
<welcome-file>default.htm</welcome-file>
<welcome-file>default.jsp</welcome-file>
</welcome-file-list>
</web-app>
