XML—detailed explanation of programming to try to add, delete, check, and modify an XML document

Corresponding program: project: TestDoProject

Corresponding program: javaWeb day01

1. You must learn to program a project into modules: This program is divided into 4 modules: dao, doMain, tool, view

• dao: This package stores functions that directly operate on files. The main method can call the methods in this package to operate on XML documents;

• doMain: This package is a constructor package

• tool: This package is a tool package. Write the tool class you want to use and put it in this The package facilitates program calls without having to type the code every time;

• view: This package contains interface classes for dealing with users, and the main class is here;

2. Frequently used in this program:

• document has many ways to easily modify the document;

• element tag;

• attribute attribute;

##3. Problems encountered:

• When deleting the design, an error was reported because the changes were not written into the document at the end;

• When searching for the design, the exam_id in the video was an attribute and my name is a label, so using attribute prompts a null pointer exception;

• When designing the search, due to accidentally adding ";" and "{}" after for, a null pointer prompt was misplaced. Abnormal, it took a long time to debug.

4. When solving problems, sometimes first check whether the program syntax or structure is wrong, and solve small problems first.

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