今天你还是像往常一样来上班，一如既往地開始了你的编程工作。
项目经理告诉你，今天想在server端添加一个新功能。希望写一个方法。能对Book对象进行处理。将Book对象的全部字段以XML格式进行包装。这样以后能够方便与client进行交互。而且在包装開始前和结束后要打印日志，这样方便调试和问题定位。
没问题！你认为这个功能简直是小菜一碟，很自信地開始写起代码。
Book对象代码例如以下：
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public class Book {
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private String bookName;
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private int pages;
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private double price;
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private String author;
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private String isbn;
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public String getBookName() {
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return bookName;
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}
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public void setBookName(String bookName) {
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this.bookName = bookName;
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}
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public int getPages() {
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return pages;
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}
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public void setPages(int pages) {
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this.pages = pages;
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}
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public double getPrice() {
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return price;
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}
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public void setPrice(double price) {
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this.price = price;
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}
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public String getAuthor() {
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return author;
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}
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public void setAuthor(String author) {
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this.author = author;
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}
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public String getIsbn() {
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return isbn;
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}
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public void setIsbn(String isbn) {
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this.isbn = isbn;
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}
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}
然后写一个类专门用于将Book对象包装成XML格式：
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public class Formatter {
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public String formatBook(Book book) {
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System.out.println("format begins");
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String result = "";
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result += "<book_name>" + book.getBookName() + "</book_name>\n";
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result += "<pages>" + book.getPages() + "</pages>\n";
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result += "<price>" + book.getPrice() + "</price>\n";
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result += "<author>" + book.getAuthor() + "</author>\n";
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result += "<isbn>" + book.getIsbn() + "</isbn>\n";
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System.out.println("format finished");
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return result;
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}
