java的信仰3Word下载.docx
- 文档编号:4466944
- 上传时间:2023-05-03
- 格式:DOCX
- 页数:9
- 大小:179.66KB
java的信仰3Word下载.docx
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publicstaticfinalStringDriver="
com.mysql.jdbc.Driver"
;
publicstaticfinalStringurl="
jdbc:
mysql:
//localhost:
3306/lzc?
characterEncoding=utf-8"
/*往数据库写字段编码格式*/
publicstaticfinalStringuser="
root"
publicstaticfinalStringpassword="
123456"
publicJDBCutil(){
}
publicstaticConnectiongetConnection()throwsSQLException{
try{
Class.forName(Driver);
conn=DriverManager.getConnection(url,user,password);
System.out.println(conn);
System.out.println("
数据库连接成功"
);
}catch(ClassNotFoundExceptione){
//TODOAuto-generatedcatchblock
e.printStackTrace();
}
returnconn;
publicstaticvoidmain(String[]args){
try{
System.out.println(getConnection());
}catch(SQLExceptione){
//TODOAuto-generatedcatchblock
e.printStackTrace();
}
/*publicstaticvoidjdbcClose(){
if(conn!
=null){
conn.close();
关闭"
}catch(SQLExceptione){
}*/
3过滤器的固定写法
Web.xml
<
?
xmlversion="
1.0"
encoding="
UTF-8"
>
web-appxmlns:
xsi="
http:
//www.w3.org/2001/XMLSchema-instance"
xmlns="
//xmlns.jcp.org/xml/ns/javaee"
xsi:
schemaLocation="
//xmlns.jcp.org/xml/ns/javaeehttp:
//xmlns.jcp.org/xml/ns/javaee/web-app_3_1.xsd"
id="
WebApp_ID"
version="
3.1"
<
display-name>
javaee<
/display-name>
welcome-file-list>
welcome-file>
index.html<
/welcome-file>
index.htm<
index.jsp<
default.html<
default.htm<
default.jsp<
/welcome-file-list>
filter>
filter-name>
userFilter<
/filter-name>
filter-class>
filter.UserFilter<
/filter-class>
/filter>
filter-mapping>
url-pattern>
/*<
/url-pattern>
/filter-mapping>
/web-app>
UserFilter.java
packagefilter;
importjava.io.IOException;
importjavax.servlet.Filter;
importjavax.servlet.FilterChain;
importjavax.servlet.FilterConfig;
importjavax.servlet.ServletException;
importjavax.servlet.ServletRequest;
importjavax.servlet.ServletResponse;
importjavax.servlet.http.HttpServletRequest;
importjavax.servlet.http.HttpServletResponse;
publicclassUserFilterimplementsFilter{
@Override
publicvoiddestroy(){
//TODOAuto-generatedmethodstub
publicvoiddoFilter(ServletRequestarg0,ServletResponsearg1,FilterChainarg2)
throwsIOException,ServletException{
HttpServletRequestreq=(HttpServletRequest)arg0;
HttpServletResponseresp=(HttpServletResponse)arg1;
req.setCharacterEncoding("
utf-8"
resp.setCharacterEncoding("
arg2.doFilter(arg0,arg1);
publicvoidinit(FilterConfigarg0)throwsServletException{
4程序错误一般出现在
5JavaEE的业务逻辑
- 配套讲稿:
如PPT文件的首页显示word图标,表示该PPT已包含配套word讲稿。双击word图标可打开word文档。
- 特殊限制:
部分文档作品中含有的国旗、国徽等图片,仅作为作品整体效果示例展示,禁止商用。设计者仅对作品中独创性部分享有著作权。
- 关 键 词:
- java 信仰