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this is answer for ssd7 exercise 4

java的http post上传例子，请修改data.properties文件中内容(examples of java http post upload, modify file contents data.properties)

This was the public transportation inquiry system software engineering design documents, including the demand analysis, the outline design, the contact surface design and so on a series of designs documents, made the comprehensive analysis to the public transportation systems engineering to design ,Java,software(This was the public transportation inquir y system software engineering design document s, including the demand analysis, the outline design, the contact surface design and so on a series of d esigns documents, made the comprehensive analysis to the public not ransportation systems engineering to design, Java, software)

说明：  Java Comm Version 2, can use for SMSLib

在Eclipse上编写的简单网格计算（加法运算），内容简单，但包含了网格计算的基本步骤。(In Eclipse to write a simple grid computing (addition operator), the content is simple, but contains the basic steps of grid computing.)

ssm+maven整合实例，这是一个简单的实例，可以发布对于ssm框架与maven工具使用。(Example of SSM + Maven integration. This is a simple example that can be published for use with SSM frameworks and maven tools.)

说明：  控制条件语句的变量，在for循环结束后，就不可以被访问了，而while循环还可以访问，如果你继续想使用该变量，则可以使用while循环，否则推荐使用for循环，原因是for循环结束，该变量就从内存中消失，能够提高内存的使用效率。(The variable that controls the conditional statement is not accessible after the for loop has finished, and the while loop is accessible if you continue to use the variable, you can use the while loop. Otherwise, it is recommended to use the for loop, because the variable disappears from memory after the for loop, which can improve memory efficiency.)

Hadoop的一个教程，不错的书，值得收藏(Hadoop tutorial, a good book, worthy of collection)

张孝祥《深入体验Java Web开发内幕——核心基础》第四章(Zhang Xiaoxiang "in-depth experience of Java Web Development insider-- the core foundation" Chapter 4)

一个简单的Java画板 很简单的只有几个基本功能(A simple Java Sketchpad is very simple, only a few basic functions)