request与response

本文介绍了Servlet中的关键API,包括如何使用HttpServletRequest和HttpServletResponse处理HTTP请求和响应。详细解释了request对象的方法,如设置字符编码、获取路径信息等,及response对象的缓存控制。

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在servlet中的request和response最好是HttpServletRequest和HttpServletResponse,如果不是应该强转为这两种类型,否则好多重要的方法会掉不到
比如把ServletRequest转化为HttpServletRequest,ServletResponse转化为HttpServletResponse

request:
<%=  request.getContextPath()  %>        ——>创建虚拟目录
request.setCharacterEncoding("gbk");       ——>只对post请求有效;只能放在第一行
request.getRequestDispatcher("...").forward(request,response);
request.getSession(true):  创建session时若存在session则返回该会话,否则创建一个新session
request.getSession(false):    创建session时若存在session则返回该会话,否则返回null
request.getRequestUri对应:    /drp6.3/login.jsp
request.getRequestUrl对应:    http://192.168.0.1:8080/drp6.3/login.jsp

response
response.setHeader("Cache-control","max-age=5000");          //filter中设置缓存时间为5000秒
Rebuild started: Project: Project *** Using Compiler &#39;V6.22&#39;, folder: &#39;E:\Keil_v5\ARM\ARMCLANG\Bin&#39; Rebuild target &#39;Target 1&#39; assembling startup_stm32f10x_md.s... Start/core_cm3.c(445): error: non-ASM statement in naked function is not supported 445 | uint32_t result=0; | ^ Start/core_cm3.c(442): note: attribute is here 442 | uint32_t __get_PSP(void) __attribute__( ( naked ) ); | ^ Start/core_cm3.c(465): error: parameter references not allowed in naked functions 465 | "BX lr \n\t" : : "r" (topOfProcStack) ); | ^ Start/core_cm3.c(461): note: attribute is here 461 | void __set_PSP(uint32_t topOfProcStack) __attribute__( ( naked ) ); | ^ Start/core_cm3.c(479): error: non-ASM statement in naked function is not supported 479 | uint32_t result=0; | ^ Start/core_cm3.c(476): note: attribute is here 476 | uint32_t __get_MSP(void) __attribute__( ( naked ) ); | ^ Start/core_cm3.c(499): error: parameter references not allowed in naked functions 499 | "BX lr \n\t" : : "r" (topOfMainStack) ); | ^ Start/core_cm3.c(495): note: attribute is here 495 | void __set_MSP(uint32_t topOfMainStack) __attribute__( ( naked ) ); | ^ 4 errors generated. compiling core_cm3.c... compiling misc.c... compiling system_stm32f10x.c... compiling stm32f10x_adc.c... compiling stm32f10x_dac.c... compiling stm32f10x_exti.c... compiling stm32f10x_dbgmcu.c... compiling stm32f10x_dma.c... compiling stm32f10x_crc.c... compiling stm32f10x_cec.c... compiling stm32f10x_bkp.c... compiling stm32f10x_can.c... compiling stm32f10x_flash.c... compiling stm32f10x_pwr.c... compiling stm32f10x_fsmc.c... compiling stm32f10x_
03-31
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