用freemarker重新定位光标 [英] Repositioning the cursor with freemarker

问题描述

我正在使用免费的标记和Java.我必须在txt文件上输出结果.假设我必须将3列打印为

I am working with free marker and java. I have to output result on a txt file. Say i have to print for 3 columns as

`A     B      C`

在类似的模式中.所有三个属性都作为字符串. 条件是，如果引用A的字符串的长度大于3，则应在下一行中打印它.也就是说，如果长度为8，则前3个字符将位于第一行，第二至4至6个字符，而其余两个则位于第三行.现在之后，当我必须打印B时，我必须回到第一行，但是A的当前位置将是第3行.

In the similar patter. All three attributes as string. Condition is that, if the length of string referring to A is more than 3 than it should be printed in the next line. That is if the length is 8 then first 3 character will be in first line, 4 to 6 in second and the remaining two in third. Now after that when I have to print for B, i would have to come back to the first line, but the current position for A will be line 3.

我该怎么做?

示例

Hi,                          (required cursor position to print for B).
Hel
lo(current cursor position)

推荐答案

我不知道freemarker，这是仅使用String操作的一种方法:

I don't know freemarker, Here is one approach by just using String manipulation:

1. 带一个StringBuilder
2. A，B或C剩下任何字符
3. 对于A，附加最多提取3个字符
4. 将空格附加到8个字符
5. 对于B，追加最多提取3个字符
6. 将空格附加到8个字符
7. 对于C，追加最多提取3个字符
8. 将空格附加到8个字符
9. 追加换行符

1. Take a StringBuilder
2. While A, B or C has any characters left
3. For A, append extract max 3 characters
4. append blank spaces till 8 characters
5. For B, append extract max 3 characters
6. append blank spaces till 8 characters
7. For C, append extract max 3 characters
8. append blank spaces till 8 characters
9. append newline

这是代码示例，可能没有进行优化，但是可以工作:

Here is code example, might not be optimized but works:

public static void main(String[] args) {
  System.out.println(formatOutput("Hello", "How are you?", "Wassup"));
}

public static String formatOutput(String textA, String textB, String textC) {
    StringBuilder output = new StringBuilder("");

    int beginIndex = 0, endIndex = 3;
    String snippet;
    while (textA.length() > 0 || textB.length() > 0 || textC.length() > 0) {
        if (textA.length() > endIndex) {
            snippet = textA.substring(beginIndex, endIndex);
            textA = textA.substring(endIndex);
        } else {
            snippet = textA.substring(beginIndex);
            textA = "";
        }
        output.append(snippet);
        for (int i = snippet.length(); i <= 8; i++)
            output.append(" ");
        ;

        if (textB.length() > endIndex) {
            snippet = textB.substring(beginIndex, endIndex);
            textB = textB.substring(endIndex);
        } else {
            snippet = textB.substring(beginIndex);
            textB = "";
        }
        output.append(snippet);
        for (int i = snippet.length(); i <= 8; i++)
            output.append(" ");


        if (textC.length() > endIndex) {
            snippet = textC.substring(beginIndex, endIndex);
            textC = textC.substring(endIndex);
        } else {
            snippet = textC.substring(beginIndex);
            textC = "";
        }
        output.append(snippet);
        for (int i = snippet.length(); i <= 3; i++)
            output.append(" ");
        output.append("\n");    
    }
    return output.toString();
}

输出:

Hel      How      Was 
lo        ar      sup 
         e y          
         ou?          

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