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js中文参数传递乱码
- 博客分类:
- js
js传参数乱码
前端l两次encode
var unitNm = encodeURI(encodeURI(unitNm));
action中decode
unitNm = URLDecoder.decode(unitNm,"UTF-8");
How does JSON work?
Sometimes, you will hear people talk about eval, which generally refers to JSON.
The eval function is what JavaScript uses to interpret a JSON string, converting it
into the objects, arrays, and functions that we are using.
function addUser() {
window.self.location
="userinput.jsp";
}
//js数组的使用
function deleteUser(){
var flag = false;
var selectFlags = document.getElementsByName("selectFlag");
for(var i=0;i<selectFlags.length;i++){
if(select ...
import java.io.IOException;
import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;
public class CharacterEncodingFilter implements Filter ...
<table width="100%" border="0" align="center">
<tr>
<td width="3%" height="26"><input type="checkbox" name="selectall" id="selectall"/></td>
<td width="18%">用户代 ...
delete from people
where peopleId
in (select peopleId from
people group by peopleId having count(peopleId) > 1)
and
rowid not in (select min(rowid) from people group by peopleId having
count(peopleId )>1)
数据库事务概念
什么是数据库事务?
事务(transaction)是由一系列操作序列构成的程序执行单元,这些操作要么都做,要么都不做,是一个不可分割的工作单位。
数据库事务的四个基本性质(ACID)
1. 原子性(Atomicity)
事务的原子性是指事务中包含的所有操作要么全做,要么全不做(all or none)。
2. 一致性(Consistency)
在事务开始以前,数据库处于一致性的状态,事务结束后,数据库也必须处于一致性状态。
拿银行转账来说,一致性要求事务的执行不应改变A、B
两个账户的金额总和。如果没有这种一致性要求,转账过程中就会发生钱无中生有, ...
由于http协议的无状态性-对于客户端的前后两个连接http无法识别他们是否来自同一客户端
于是出现了cookie用于在客户端后续连接中提供会话信息,但是客户端可以禁用,手动修改,删除cookie
public void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
//位于客户端内存的cookie生命周期与客户端http浏览器窗口一致
...
web.xml
<servlet-mapping>
<servlet-name>pathServlet</servlet-name>
<url-pattern>/servlet/pathTest</url-pattern>
</servlet-mapping>
这里的第一个/代表绝对路径如 http://127.0.0.1/user/
index.jsp
采用绝对路径--- 这里的第一个/代表的是 http://127.0.0 ...
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.net.Socket;
public class TestHTTP {
public static void main(String[] args) throws Exception {
Socket s = new Socket("127.0.0.1", ...
file:///F:/Tomcat%206.0/conf/context.xml
<Context reloadable="true">
<!-- Default set of monitored resources -->
<WatchedResource>WEB-INF/web.xml</WatchedResource>
<!-- Uncomment this to disable session persistence across Tomcat restarts ...
[size=medium][size=small]select ename,sal
case when sal<2000 then 'UNDERPAID'
when sal>2000 then 'OVERPAID'
else 'OK'
end as status
from emp;
[/size]
[/size]