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调用Servlet原理之Class类的反射机制

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sudo apt-get update

Apache.汤姆cat 调用Servlet原理之Class类的反光机制,用orc类解释,

有二个兽人类

package com.swift.servlet;

public class OrcDemo {
private int hp;
private int mp;
private int atk;
public int getHp() {
return hp;
}
public void setHp(int hp) {
this.hp = hp;
}
public int getMp() {
return mp;
}
public void setMp(int mp) {
this.mp = mp;
}
public int getAtk() {
return atk;
}
public void setAtk(int atk) {
this.atk = atk;
}

public OrcDemo() {
}
public OrcDemo(int hp, int mp, int atk) {
super();
this.hp = hp;
this.mp = mp;
this.atk = atk;
}
public void orcInfo() {
System.out.println("hp"+hp+"mp"+mp+"atk"+atk);
}
public static void main(String[] args) {
OrcDemo orc=new OrcDemo(3000,2000,500);
orc.orcInfo();
}
}

原本的兽人对象使用方法:
public static void main(String[] args) {
OrcDemo orc=new OrcDemo(3000,2000,500);
orc.orcInfo();
}
使用Class类反射,得到兽人对象全部内容:

Class c=Class.forName(“OrcDemo”);
OrcDemo od=(OrcDemo)c.newInstance();
od.orcInfo();

apache.tomcat正是接纳这种情势调用的Servlet

web.xml配置文件中
<servlet>
    <servlet-name>ServletDemo</servlet-name>
    <servlet-class>com.swift.servlet.TestServlet</servlet-class>
</servlet>
<servlet-mapping>
    <servlet-name>ServletDemo<servlet-name>
    <url-pattern>/test</url-pattern>
</servlet-mapping>

把上面的<servlet-class>com.swift.servlet.TestServlet</servlet-class>中的com.swift.servlet.TestServlet拿出来使用即可

应用到刚才写的反射代码
Class c=Class.forName("OrcDemo");
OrcDemo od=(OrcDemo)c.newInstance();
od.orcInfo();
变为

Class c=Class.forName("com.swift.servlet.TestServlet");

//ServletDemo sd=(ServletDemo)c.newInstance();/*tomcat就是因为不知道有      ServletDemo这个类,才使用反射方法,这里我们可以用他的父类,多态就可以了*/

HttpServlet hs=c.newInstance();

hs.doGet();

  

 

 

调用Servlet原理之Class类的反光机制,用orc类解释, 有多少个兽人类 package
com.swift.servlet; public class Orc德姆o { private int hp; private int
mp…

Modules/2.x/readline.c:684: error: ‘doc_replace_history’ undeclared
here (not in a function)

sudo apt-get install android-studio

Modules/2.x/readline.c:1119: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or
‘__attribute__’ before ‘initreadline’

Android Studio 1.3 公布下载
http://www.linuxidc.com/Linux/2015-07/120825.htm

Modules/2.x/readline.c:647: error: expected ‘)’ before string constant

Android Studio
是一个由谷歌(Google)成立的安卓开辟条件,类似于
Eclipse,为开采和调理提供工具。最新的本子是 Android Studio
1.3,详细变化。

逐个审查思路:从上述报错可以知道:ImportError: No module named
readline,缺少readline模块

sudo apt-get remove android-studio

make && make install

卸载 android-studio 命令

Modules/2.x/readline.c:657: error: ‘METH_NOARGS’ undeclared here (not
in a function)

sudo add-apt-repository ppa:paolorotolo/android-studio

  File “setup.py”, line 8, in <module>

Ubuntu 安装命令

Modules/2.x/readline.c:659: error: ‘doc_redisplay’ undeclared here (not
in a function)

图片 1

[root@linuxidc2 readline-6.2.4.1]# python setup.py build

————————————–分割线

越多Android
Studio相关内容能够看看以下的有用链接

在Ubuntu 15.04下安装Android Studio 
http://www.linuxidc.com/Linux/2015-06/119318.htm 

Ubuntu 12.04(64位)安装Android Studio 全过程
http://www.linuxidc.com/Linux/2013-05/84812.htm 

Android Studio v0.1尝鲜
http://www.linuxidc.com/Linux/2013-05/84681.htm 

Android Studio使用教程
http://www.linuxidc.com/Linux/2013-05/84579.htm 

Android Studio开辟指南
http://www.linuxidc.com/Linux/2013-05/84543.htm 

Android Studio设置大旨 和 不帮助汉语的主题素材消除方法
http://www.linuxidc.com/Linux/2013-05/84488.htm 

Android Studio 下载安装以至无法展开的消除办法
http://www.linuxidc.com/Linux/2013-05/84409.htm 

Android Studio安装使用图像和文字化教育程
http://www.linuxidc.com/Linux/2014-09/106914.htm 

Android Studio
的事无巨细介绍
:请点这里
Android Studio
的下载地址
:请点这里 

越来越多Android相关音信见Android 专项论题页面 http://www.linuxidc.com/topicnews.aspx?tid=11

正文永恒更新链接地址:http://www.linuxidc.com/Linux/2015-08/121004.htm 

图片 2

Modules/2.x/readline.c:622: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or
‘__attribute__’ before ‘*’ token

Modules/2.x/readline.c:98: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or
‘__attribute__’ before ‘*’ token

Linux linuxidc.test.com 2.6.32-358.el6.x86_64 #1 SMP Fri Feb 22
00:31:26 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux

一、具体安装:

Modules/2.x/readline.c:741: error: ‘startup_hook’ undeclared (first use
in this function)

Modules/2.x/readline.c:372: warning: implicit declaration of function
‘free’

缓慢解决方式:yum -y  install gcc python-devel

Modules/2.x/readline.c: In function ‘on_pre_input_hook’:

Modules/2.x/readline.c:686: error: ‘doc_get_completer_delims’
undeclared here (not in a function)

gcc: readline/libreadline.a:未有特别文件或目录

Modules/2.x/readline.c:676: error: ‘doc_get_completion_type’
undeclared here (not in a function)

Modules/2.x/readline.c:283: error: expected ‘)’ before string constant

CentOS release 6.4
(Final)

./readline/rltypedefs.h:64: error: expected ‘)’ before ‘*’ token

Modules/2.x/readline.c:817: warning: implicit declaration of function
‘PyString_AsString’

Modules/2.x/readline.c:154: error: expected ‘)’ before string constant

creating build

[root@linuxidc2 ~]# tar zxf setuptools-0.6c11.tar.gz -C /usr/src/

Modules/2.x/readline.c:229: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or
‘__attribute__’ before ‘*’ token

./readline/readline.h:542: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or
‘__attribute__’ before ‘*’ token

Modules/2.x/readline.c:607: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or
‘__attribute__’ before ‘*’ token

Modules/2.x/readline.c:673: error: ‘set_completer’ undeclared here (not
in a function)

gcc -pthread -fno-strict-aliasing -O2 -g -pipe -Wall
-Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector
–param=ssp-buffer-size=4 -m64 -mtune=generic -D_GNU_SOURCE -fPIC
-fwrapv -DNDEBUG -O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2
-fexceptions -fstack-protector –param=ssp-buffer-size=4 -m64
-mtune=generic -D_GNU_SOURCE -fPIC -fwrapv -fPIC -DHAVE_RL_CALLBACK
-DHAVE_RL_CATCH_SIGNAL -DHAVE_RL_COMPLETION_APPEND_CHARACTER
-DHAVE_RL_COMPLETION_DISPLAY_MATCHES_HOOK
-DHAVE_RL_COMPLETION_MATCHES -DHAVE_RL_COMPLETION_SUPPRESS_APPEND
-DHAVE_RL_PRE_INPUT_HOOK -I. -I/usr/include/python2.6 -c
Modules/2.x/readline.c -o
build/temp.linux-x86_64-2.6/Modules/2.x/readline.o
-Wno-strict-prototypes

cd Python-2.7.10

ImportError: No module named readline

creating build/temp.linux-x86_64-2.6/Modules

————————————–分割线

不要操作系统直接运营 Python 代码 
http://www.linuxidc.com/Linux/2015-05/117357.htm

CentOS上源码安装Python3.4 
http://www.linuxidc.com/Linux/2015-01/111870.htm

《Python核心编制程序 第二版》.(Wesley J. Chun ).[高清PDF中文版]
http://www.linuxidc.com/Linux/2013-06/85425.htm

《Python开垦技艺详解》.( 马大为,宗杰).[高清PDF扫描版+随书录像+代码]
http://www.linuxidc.com/Linux/2013-11/92693.htm

Python脚本获取Linux系统新闻
http://www.linuxidc.com/Linux/2013-08/88531.htm

在Ubuntu下用Python搭建桌面算法交易研商景况
http://www.linuxidc.com/Linux/2013-11/92534.htm

Python 语言的进化简史
http://www.linuxidc.com/Linux/2014-09/107206.htm

Modules/2.x/readline.c:694: error: ‘doc_set_pre_input_hook’
undeclared here (not in a function)

Modules/2.x/readline.c:356: error: expected ‘)’ before string constant

Modules/2.x/readline.c:599: error: expected ‘)’ before string constant

    from setuptools import setup, Extension

Modules/2.x/readline.c:1014: warning: implicit declaration of function
‘PyOS_setsig’

Traceback (most recent call last):

Modules/2.x/readline.c:665: error: ‘get_history_item’ undeclared here
(not in a function)

============ Building the readline extension module ============

Modules/2.x/readline.c:225: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or
‘__attribute__’ before ‘*’ token

creating build/temp.linux-x86_64-2.6

Modules/2.x/readline.c: At top level:

Modules/2.x/readline.c: In function ‘_py_get_history_length’:

Modules/2.x/readline.c:781: error: ‘Py_None’ undeclared (first use in
this function)

Modules/2.x/readline.c:493: error: expected ‘)’ before string constant

[root@linuxidc2 ~]# cd /usr/src/setuptools-0.6c11/

Modules/2.x/readline.c:1111: error: expected ‘)’ before string constant

Modules/2.x/readline.c:667: error: ‘PyCFunction’ undeclared here (not in
a function)

Modules/2.x/readline.c: At top level:

Modules/2.x/readline.c: In function ‘_py_free_history_entry’:

Modules/2.x/readline.c:486: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or
‘__attribute__’ before ‘*’ token

Modules/2.x/readline.c:805: error: ‘PyObject’ undeclared (first use in
this function)

Modules/2.x/readline.c:901: error: ‘endidx’ undeclared (first use in
this function)

Modules/2.x/readline.c:691: error: ‘doc_set_startup_hook’ undeclared
here (not in a function)

Modules/2.x/readline.c:296: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or
‘__attribute__’ before ‘*’ token

Modules/2.x/readline.c:660: error: ‘doc_read_init_file’ undeclared
here (not in a function)

Modules/2.x/readline.c: In function ‘flex_complete’:

Modules/2.x/readline.c: In function ‘setup_readline’:

Modules/2.x/readline.c:661: error: ‘read_history_file’ undeclared here
(not in a function)

Modules/2.x/readline.c:688: error:
‘set_completion_display_matches_hook’ undeclared here (not in a
function)

Modules/2.x/readline.c:139: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or
‘__attribute__’ before ‘*’ token

Modules/2.x/readline.c:660: error: ‘read_init_file’ undeclared here
(not in a function)

Modules/2.x/readline.c:276: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or
‘__attribute__’ before ‘*’ token

下载地址:

[root@linuxidc2 setuptools-0.6c11]# python setup.py build

Modules/2.x/readline.c:639: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or
‘__attribute__’ before ‘*’ token

Modules/2.x/readline.c: In function ‘on_completion’:

Modules/2.x/readline.c:658: error: ‘doc_insert_text’ undeclared here
(not in a function)

Modules/2.x/readline.c:656: error: ‘METH_VARARGS’ undeclared here (not
in a function)

[root@linuxidc2 ~]# cd /usr/src/readline-6.2.4.1/

下载地址:

Modules/2.x/readline.c:674: error: ‘doc_get_completer’ undeclared here
(not in a function)

Modules/2.x/readline.c:748: error: ‘pre_input_hook’ undeclared (first
use in this function)

Modules/2.x/readline.c:677: error: ‘get_begidx’ undeclared here (not in
a function)

Modules/2.x/readline.c:662: error: ‘doc_read_history_file’ undeclared
here (not in a function)

Modules/2.x/readline.c:656: error: ‘doc_parse_and_bind’ undeclared
here (not in a function)

Modules/2.x/readline.c:760: error: ‘r’ undeclared (first use in this
function)

依照实况来看,是或不是须求设置任何的软件包:zlib-devel openssl-devel
libffi-devel (笔者的机器安装上,后来又移除了,python蒙受运转如常)

gcc -pthread -fno-strict-aliasing -O2 -g -pipe -Wall
-Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector
–param=ssp-buffer-size=4 -m64 -mtune=generic -D_GNU_SOURCE -fPIC
-fwrapv -DNDEBUG -O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2
-fexceptions -fstack-protector –param=ssp-buffer-size=4 -m64
-mtune=generic -D_GNU_SOURCE -fPIC -fwrapv -fPIC -DHAVE_RL_CALLBACK
-DHAVE_RL_CATCH_SIGNAL -DHAVE_RL_COMPLETION_APPEND_CHARACTER
-DHAVE_RL_COMPLETION_DISPLAY_MATCHES_HOOK
-DHAVE_RL_COMPLETION_MATCHES -DHAVE_RL_COMPLETION_SUPPRESS_APPEND
-DHAVE_RL_PRE_INPUT_HOOK -I. -I/usr/include/python2.6 -c
Modules/2.x/readline.c -o
build/temp.linux-x86_64-2.6/Modules/2.x/readline.o
-Wno-strict-prototypes

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